EN
Previous research has established the structure of the Lithuanian army during the wars with the Ottoman Empire for the years 1673, 1675–1676, and 1683–1686. However, the specific composition and strength of the Grand Duchy of Lithuania’s army, as determined by the size of the standing army (Pol. komput) adopted by the Sejm in Warsaw in 1690, remain unclear. The surviving documentation from the Vilnius Committee (8 January – 17 March 1691 and 13 February – 31 March 1692) and the Grodno Tribunal (15 September – 13 October 1691), i.e. institutions responsible for settling accounts with the army for its service during 1690–1691, enabled the identification of almost all the troops and their structure. The primary source material includes declarations from tax collectors regarding the allocation of funds from the 26 hearth taxes (Pol. podymne) passed by the Sejm. The objective of this article is to analyse this documentation to determine the composition of the Lithuanian army units in 1690–1691 and to present their structure. The research identified 77 out of at least 79 military units comprising the Grand Duchy of Lithuania’s forces at that time, including: five hussar cavalry units (Pol. chorągiew), 23 armoured companion (Pol. pancerni) cavalry units, seven Reiter cavalry units, eight Tartar cavalry units, 15 dragoon squadrons and cavalry units, 12 German infantry units, five Hungarian infantry units, one Janissary unit, and one Zaporozhian Cossack unit. Nearly 46 per-cent of this army consisted of military units serving the Sapieha family, indicating the significant influence of the political faction led by Vilnius Voivode and Grand Hetman of Lithuania Kazimierz Jan Sapieha.