Ottoman Military and Warfare — Imperial Ottoman

The Ottoman state was built by its armies. For more than six centuries, the military formed the backbone of Ottoman political identity, social structure, and imperial expansion. From the modest bands of Turkic horsemen who followed Osman I in the late thirteenth century to the conscript armies that fought on four fronts in the First World War, Ottoman warfare underwent a series of profound transformations. Horse-archers gave way to disciplined musketeers, walled cities fell to colossal bombards, a Mediterranean fleet projected power from Algiers to the Indian Ocean, and a once-feared standing army was eventually abolished by its own sultan.

This article surveys the full arc of that military history. It examines the tribal origins of Ottoman warfare under the beylik of Söğüt, the rise of the sipahi cavalry, the recruitment of Christian boys into the elite Janissary corps, the gradual adoption of gunpowder weapons, the conduct of major sieges, the administration of the imperial fleet, and the long nineteenth-century struggle to reform an army that the modern world had begun to outpace. The siege of Vienna in 1683 is the conventional turning point; the campaign at Gallipoli in 1915-16 is its final major chapter.

Origins: the frontier warriors of a small beylik

The Ottomans emerged in the late thirteenth century as one of several Turkmen principalities on the Byzantine frontier in north-western Anatolia. Their early military ethos was inherited from the uç (march or borderland) traditions of the Seljuk and Danişmendid states. The land was poor and the population thin, and the ruling house relied on two intertwined instruments of war: the gazi warriors motivated by religious enthusiasm, and the tribal cavalry supplied by the Turkmen pastoralists.

Light horse-archers dominated these campaigns. A typical raiding party comprised horsemen armed with composite bows, short swords, and round leather shields, supported by lightly armed footmen. Surprise, mobility, and the rapid exploitation of success were more important than the heavy formations of the Mamluks or the Mamluks’ Latin contemporaries in Syria and Egypt. Christian and Muslim chroniclers agreed on the difficulty of pinning down Ottoman raiders in the wooded hills of Bithynia.

Two institutional features set the early Ottomans apart from their neighbours. The first was the akıncı corps, semi-regular light cavalry that served as scouts, raiders, and the vanguard of any serious expedition. The second was the systematic use of the dirlik and timar — the prebendal fief — to bind mounted warriors to the ruling house in return for service. The akıncı raids into the Balkans from the 1350s, often deep into Hungary and Bosnia, are among the most striking features of late medieval warfare on the European continent.

The akıncı deserves a brief note. The corps was headed by a beylerbey of the akıncı, who reported directly to the sultan or the grand vizier, and its members were drawn from the Turkish-speaking and, increasingly, from the Slavic- and Albanian-speaking population of the marches. The akıncı fought as light horse-archers and lancers, with no armour beyond a leather cap and a light mail shirt. They were superb skirmishers, equally at home in the wooded hills of the Balkans and the open plains of Hungary. The akıncı also served as the eyes of the army: a serious campaign was preceded by a long reconnaissance in force, in which the akıncı mapped the routes, identified the rivers and the fords, and probed the enemy’s frontier posts. Their operational reach, in the late fourteenth and early fifteenth centuries, is one of the most striking features of Ottoman warfare, and the akıncı raid of 1363 into Thrace, of 1389 into Bosnia, and of 1428 deep into Transylvania are notable early examples. The akıncı gradually declined in importance as the Janissaries and the sipahi cavalry became the central forces of the army, but the corps survived, in a reduced form, into the seventeenth century.

The sipahi cavalry and the timar system

The sipahis were the provincial cavalry of the Ottoman state, drawn from the Muslim landholding class and supported by a system of land tenure that was both fiscal and military. A timar was a revenue unit, generally a village or part of one, granted to a cavalryman in return for his service in the army. The sipahi in turn was expected to appear at the muster with a certain number of armed retainers, his cebelu, and to maintain his own horse, arms, and equipment. A senior timar, the zeamet, or a has (an estate reserved for the sultan and his senior officers) sat above the basic timar in a careful hierarchy.

The system, in its mature form, is described in greater detail in the article on the provincial sipahi cavalry. It produced a self-financing cavalry arm that was broadly comparable in scale to the contemporary European feudal levy, but tied more directly to the central authority. The sipahi served only in his home province, was paid only when on campaign, and lost his timar if he failed to answer the summons. In return, his fief was hereditary in practice, and the assessment of timars was recalculated roughly every generation by the defterhane, the imperial register office.

The strengths of the timar system were considerable. It mobilised substantial numbers of horsemen at low direct cost to the treasury, it distributed power and loyalty across the Anatolian and Balkan countryside, and it gave the state a flexible instrument of local administration. Its weaknesses became apparent in the seventeenth and eighteenth centuries, as the cost of war rose, the value of the land grants declined relative to cash payments, and the sipahis themselves became more interested in tax-farming than in the field. The classical army of Mehmed II and Suleiman, however, was unimaginable without them.

The army of Mehmed II and the Ottoman classical system

The conquest of Constantinople in 1453 marked the transition from a marcher principality to a Mediterranean empire, and the army that accomplished the conquest is a useful summary of the classical Ottoman military system. The army was a layered structure. At the centre stood the household troops: the Janissary infantry, the household cavalry of the Porte, the topçu artillery corps, and the auxiliary units of the palace. Around them was the provincial levy, drawn from the timars of the Balkans and Anatolia. Beyond them were the auxiliaries: the akıncı, the Tatar cavalry of the Crimean khan, the troops of the Wallachian and Moldavian princes, and the various marcher and frontier contingents. The whole was commanded by a general staff under the grand vizier, with the sultan present in person on the major campaigns.

The same structure can be traced through the rest of the classical period. The army of Suleiman the Magnificent, of perhaps 80,000 to 100,000 men on the Hungarian campaign of 1526, was built on the same basic plan. The battle of Mohács, fought on 29 August 1526, is the apogee of the classical army: a heavy cavalry charge by the sipahis of the centre, supported by Janissary musket fire, broke the Hungarian line and killed King Louis II in his flight. The campaign of 1529 against Vienna, of 1532 against Güns, and the long wars of the 1530s and 1540s against the Habsburgs and the Safavids are the campaigns that made the empire a European and a Middle Eastern power.

The institutional and logistical apparatus that supported the army was substantial. The imperial kitchen and bakery, the imperial stables, the arsenal at the Golden Horn, the defterhane, the menzil system of staging posts, and the various provincial supply depots made possible a campaign season of several months, often conducted at great distance from the capital. The army was an army of movement: it was expected to march, to fight, to besiege, and to return, all within the space of a single campaigning season. The organisation that made this possible is part of the long story of Ottoman statecraft.

The standing army: Kapıkulu and the Janissaries

From the fourteenth century onwards, the Ottoman sultans built up a standing household army, the Kapıkulu (“slaves of the gate”), in parallel to the sipahi levies. The Kapıkulu comprised the infantry Janissary corps, the palace cavalry of the Sipahi of the Porte and the Sipahi of the Silahdar, the artillery corps (topçu), and various auxiliary and technical units. The Janissaries were by far the most famous and, in time, the most politically powerful of these units.

Recruitment to the Janissaries was for centuries carried out through the devshirme, the so-called “blood-tax” by which Christian boys aged roughly eight to eighteen were collected from the Balkan and Anatolian villages and converted to Islam. The system, which is examined in more detail in the article on the devshirme system, produced a closed corps with strong internal solidarity and a direct chain of loyalty to the sultan. Once admitted, a Janissary received a thorough military training, a regulated career, and a series of privileges, including the right to marry, to engage in trade, and to rise through the ranks of the corps to its highest offices.

The Janissary corps is the subject of its own dedicated article in this collection. It is enough to note here that the corps provided the disciplined infantry backbone of the Ottoman field army for over four hundred years. From the conquest of Constantinople in 1453 to the great sieges of the sixteenth century, the Janissary is the soldier most closely associated with Ottoman military success. The corps survived long after its military effectiveness had declined, and it was finally abolished on 17 June 1826, in the “Auspicious Incident” (Vaka-i Hayriye), when Sultan Mahmud II used loyal troops and the fury of the ulema to crush a Janissary mutiny in Constantinople and to order the dissolution of the corps.

The adoption of gunpowder weapons

The Ottoman military was an early and aggressive adopter of gunpowder. Cannon were used at the siege of Bursa in 1326, and hand-held firearms appear in Ottoman inventories within decades of their appearance in Europe. The conquest of Constantinople in 1453, mounted by Mehmed II with a siege train that included several very large bombards, is a landmark in the history of artillery. A more general discussion of this transformation is given in the article on Ottoman gunpowder siege warfare, but a few of the more important points are worth making here.

By the reign of Bayezid II (r. 1481-1512), the Ottoman artillery was organised into a permanent corps, the topçu ocak, with its own officers, training establishments, and arsenals. The corps was responsible for the casting, transport, and operation of cannon, and it provided the technical cadre for the great siege trains of the sixteenth century. The Hungarian-born engineer Orban, the cannon-founder who cast the famous Dardanelles gun for the 1464 campaign, and the master bombardiers of the Süleymaniye era are part of the same institutional story.

Infantry firearms were slower to displace the bow. Ottoman Janissaries used the bow in significant numbers well into the sixteenth century, and the corps retained its archery traditions long after most European armies had abandoned them. The matchlock musket was introduced in the later fifteenth century, but the decisive shift to firearms came under Suleiman the Magnificent and his successors. By the seventeenth century, the Janissary was, in practice, a pikeman and musketeer, organised in the standard Ottoman manner with a orta (regiment) of around 200 men.

Siege warfare and the great bombardiers

The great Ottoman sieges of the fifteenth and sixteenth centuries — Constantinople in 1453, Rhodes in 1522, Belgrade in 1521, Vienna in 1529, Malta in 1565 — are some of the most studied military operations in pre-modern history. They are discussed at length in the article on Ottoman gunpowder siege warfare, and two of the most celebrated, the Great Siege of Malta and the siege of Vienna, are treated in their own dedicated pieces.

A typical Ottoman siege combined several methods. Heavy artillery battered the walls from a distance; lighter guns swept the ramparts at close range; sappers worked their way forward to mine the foundations; and, in the final assault, massed Janissaries and assault troops attempted to storm the breaches. The technical level of Ottoman mining and countermining was high, and a substantial body of engineering treatises in Turkish, Arabic, and Persian preserves the theoretical and practical knowledge of the period.

The logistics of these operations were formidable. A campaign into Hungary in 1526 or into Persia in the 1530s required the movement of tens of thousands of men, hundreds of wagons, and large herds of livestock, supported by a chain of supply depots and bridgeheads. The Ottoman army was an army of movement as well as of battle, and the famous yeniçeri (Janissary) marching discipline and the elaborate regulations governing the camp are a major part of its reputation.

The Ottoman navy and the Mediterranean

The Ottoman fleet was, for a time, the most powerful naval force in the Mediterranean. Built up systematically from the early fourteenth century and reaching its apogee in the sixteenth, it played a decisive role in the conquest of the Aegean islands, the blockade of the Mamluk coast, the struggle for the western Mediterranean, and the long contest with the Spanish, Genoese, Venetian, and Hospitaller fleets. The history of the fleet is set out in more detail in the article on the Ottoman navy.

The main shipyard was at the Golden Horn, in the great imperial arsenal of Tersane-i Amire at Kasımpaşa. There, shipwrights — many of them recruited from the Greek-speaking and Italian-speaking maritime populations of the empire — built galleys, galliots, and the great capital ships known as kadırga and later mahmîye. The admiral of the fleet held the title of Kapudan Pasha, and the office was one of the most prestigious in the empire.

The sixteenth century was the great age of Ottoman naval power. The admiral Hayreddin Barbarossa, known in Ottoman sources as Barbaros Hayreddin Pasha, and his brother Oruç, seized Algiers in 1516 and brought the North African corsair state into the Ottoman orbit. Hayreddin served as Kapudan Pasha from 1533 until his death in 1546, and the fleet he commanded was able to challenge the Habsburg and Italian navies across the western Mediterranean. The empire’s apogee, the great sea battle of Preveza in 1538, is his; so is the heaviest defeat, the disaster of Lepanto on 7 October 1571.

Logistics, supply, and finance

The Ottoman state was an early modern power, and its military machine required an administrative apparatus of considerable sophistication. Campaigns were provisioned by the imperial kitchen and bakery (matbah-i amire and fırın-i hümayun), by the commissariat (menzil system) that maintained staging posts along the imperial roads, and by the purchasing officers who followed the army into the field. The tax revenues of the timar system and the cash revenues of the iltizam (tax-farming) system provided much of the funding.

By the seventeenth century, the financial base of the army had shifted decisively to cash payments. The Janissaries and the household cavalry were paid in coin, in three-monthly instalments, and the demand for cash drove the development of the tax-farming system and a series of debasements and fiscal reforms. The devshirme, as a source of manpower, had long since lost its primacy to voluntary recruitment and to local registration. The classical Ottoman military system, in the strict sense, was a phenomenon of the fifteenth and sixteenth centuries.

Organisation of the army in the field

A large Ottoman campaign of the classical period brought together a striking variety of forces. The household troops — Janissaries, Sipahi of the Porte, topçu — marched at the centre, under the personal command of the sultan or his grand vizier. The provincial sipahis of Rumelia and Anatolia mustered on the wings and the lines of march. The akıncı light horse ranged ahead and to the flanks, screening the army and gathering intelligence. Allied contingents from the Crimean khanate, the principalities of Wallachia and Moldavia, the Cossack hetmanate, or the Kurdish emirates added to the numbers.

Tactical doctrine emphasised the use of terrain, the concentration of force at a decisive point, and the close coordination of the Janissary musketeers with the sipahi cavalry. European observers in the sixteenth and seventeenth centuries repeatedly commented on the orderly Ottoman battle array, the silence of the troops on the march, the careful establishment of the camp, and the strict chain of command. By contrast, the same observers often noted the tendency of the akıncı to fight piecemeal, the unreliability of the vassal contingents, and the difficulty of coordinating a force drawn from so many different provinces and peoples.

The seventeenth century: long war and stagnation

The seventeenth century is conventionally treated as a period of long, costly wars and relative military stagnation. The struggle with the Habsburgs in Hungary, the long war with Venice over Crete, the unsuccessful campaigns against Persia, and the renewed pressure on Vienna from 1683 placed a heavy burden on the army and the treasury. The devshirme was no longer the main source of Janissary recruits; the corps had become largely hereditary; and the timar system was breaking down in the face of cash payments and tax-farming.

The high point of the seventeenth-century crisis was the second siege of Vienna in 1683. The Ottoman army, under Grand Vizier Kara Mustafa Pasha, reached the walls in July 1683 and began a siege that lasted until the arrival of the Polish relief army under King John III Sobieski on 12 September. The defeat was a turning point. Within a generation, the Ottomans had lost Hungary, the Morea, and the northern Black Sea coast, and the balance of power in south-eastern Europe had shifted decisively.

The eighteenth century saw a slow and uneven recovery. The military was reformed in stages, the Janissaries were partially disciplined, and the technical and tactical level of the army rose. But the underlying problems — fiscal weakness, provincial autonomy, the conservatism of the Janissary corps — remained. The empire entered the long nineteenth century in a fragile state.

The nineteenth century: reform, abolition, and the new army

The nineteenth century is, in military terms, the century of the Ottoman reforms. Mahmud II’s abolition of the Janissaries in 1826, described in the article on the Janissary corps, was the first step. A new modern infantry, the Nizam-ı Cedid (“New Order”), was raised; a French-style staff system was introduced; the military schools were reorganised; and European officers served in the Ottoman army in increasing numbers. The Prussian military mission of 1835, the French military mission of the 1850s, and the German mission of the 1880s and 1890s were major episodes in the long process of modernisation.

The Crimean War of 1853-1856 marked a high point of the new order: the Ottoman army fought, in alliance with France and Britain, and the war was followed by a series of further reforms. The brief but violent Russo-Ottoman War of 1877-1878 exposed continuing weaknesses, especially in the intelligence services, the staff work, and the supply of the army, but the army remained a serious fighting force. The Greek-Ottoman War of 1897, the Macedonian struggles of 1903-1908, the Italo-Turkish War of 1911-1912 (in which the Ottomans lost Libya and the Dodecanese), and the Balkan Wars of 1912-1913 (in which the empire lost most of its European territory) each tested the new order in different ways.

The Balkan Wars, in particular, were a serious shock. The Ottoman army lost almost all of its European territory in less than a year, and the political consequences were immediate: the Young Turk Revolution of 1908, the long period of CUP dominance, and the entry of the empire into the First World War on the side of the Central Powers in November 1914. The CUP government, dominated by Enver Pasha and his colleagues, brought the empire into the war on a calculation of strategic interest, and the army went to war in the Caucasus, in Mesopotamia, in the Sinai, and at the Dardanelles.

The First World War and Gallipoli

The Ottoman entry into the First World War in November 1914, on the side of the Central Powers, brought the army into its most sustained and most costly campaign of the twentieth century. The fighting took place on the Caucasus front against Russia, in Mesopotamia against Britain, in the Sinai and Palestine against the British Empire, and in the Dardanelles against the Entente. The campaign at Gallipoli, in 1915-1916, is treated in detail in the article on the battle of Gallipoli. It was the last great Ottoman military success, and it made the reputation of Mustafa Kemal Atatürk, the future founder of the Turkish Republic.

The other campaigns of the war were less successful. The Ottoman advance into the Caucasus in the winter of 1914-15 was halted at the battle of Sarikamish, in which Enver Pasha’s plan to envelop the Russian Caucasus army failed in the harsh mountain winter, and the army lost perhaps 60,000 men. The Mesopotamian campaign, in which the British Indian Army advanced on Baghdad and was defeated at the siege of Kut al-Amara in 1915-16, recovered, and Baghdad fell to the British in March 1917. The Sinai and Palestine campaign, which began with the British advance on the Suez Canal in 1915, was fought to a conclusion with the British capture of Jerusalem in 1917, the battle of Megiddo in 1918, and the occupation of Damascus and Aleppo. The empire was, in short, fighting on four fronts, against four different enemies, and the war effort was, by 1918, at the limit of its capacity.

The empire was defeated in 1918 and demobilised under the terms of the Armistice of Mudros. The army was dissolved along with the rest of the imperial institutions. By 1923, a new Turkish state, with a new army of its own, was established in Ankara. The Ottoman military, one of the longest-lived standing armies in world history, had come to an end.

Legacy

The Ottoman military left a deep mark on the political and administrative history of the Balkans, the Middle East, and North Africa. The timar system, the devshirme, the Janissary corps, the Kapudan Pasha, the topçu, the akıncı, and the Sipahi of the Porte are all parts of a long institutional history that shaped the empire’s neighbours as well as its subjects. The institutional vocabulary of the modern Turkish armed forces still preserves some of these older forms: the word ordu (army) is still used for the large formations of the Turkish army, and the word tümen (division), alay (regiment), and tabur (battalion) are all of Ottoman origin.

The wider cultural memory of the Ottoman military has had a long afterlife. The mehterhane, the music of the Janissary bands, is still played on state occasions in modern Turkey, and the great bombards of Mehmed II, the siege of Vienna, and the battle of Gallipoli are recurring themes in Turkish popular culture. The army of the early Turkish Republic, founded on the ruins of the Ottoman empire, took a conscious decision to incorporate some of the older Ottoman military traditions, and the officer corps of the new state was, in considerable part, the officer corps of the late-Ottoman army. The continuity of the military tradition is, in this sense, one of the most striking features of the transition from empire to republic.

A complete account of the Ottoman military would also have to address its impact on the societies it conquered and on the societies of its enemies. The most ambitious Ottoman military projects — the sieges of Constantinople, Rhodes, Vienna, and Malta; the long struggle for the Mediterranean; the campaign at Gallipoli — are windows onto a much larger history of state-building, religious transformation, and cultural exchange. The articles in this collection, from the Janissary corps and the Ottoman navy to the provincial sipahi cavalry, are intended as detailed introductions to the principal institutions, campaigns, and personalities of that history.

The Janissary corps — The elite infantry corps recruited from the Christian population through the devshirme, the most famous of all Ottoman military institutions.
The Ottoman navy — The imperial fleet built at the Golden Horn, from the conquest of the Aegean to the battle of Lepanto in 1571.
Ottoman gunpowder siege warfare — Cannons, bombards, mining, and the great sieges that defined Ottoman military expansion in the fifteenth and sixteenth centuries.
The devshirme system — The blood-tax by which Christian boys were collected for service in the Ottoman household army.
The provincial sipahi cavalry — The timariot horsemen of the Ottoman provinces, the mounted backbone of the classical army.
The siege of Vienna — The 1529 and 1683 Ottoman sieges that mark the beginning and the high-water mark of Ottoman expansion into central Europe.