Army of the Habsburg monarchy

220px|thumb|right|During this defense of the Klis Fortress against an Ottoman invasion, an elite Croatian military faction of Uskoci was formed.

Type of light infantry, 18th century

military unit

thumb|Illustration of a group of Seressaner during the 1848 Revolutions. The Seressaner (, , ) were an Habsburg military police unit in Lika, Croatian Military Frontier. The name is derived from Saracens ("tent dwellers").

Šajkaši (In Serbian, , ) refers to the river flotilla troops guarding the Danube and Sava, and especially, the Port of Belgrade, against the Ottoman Empire from the 16th to the 19th century. During that period, the rivers were natural borders of the Kingdom of Hungary and Habsburg monarchy with the Ottoman Empire, part of the Military Frontier. The troops were composed of ethnic Serbs, who had special military status. Their name derives from the small wooden boat known as chaika (šajka, tschaiken), a type of galley.

Unit of Habsburg light infantry, 1740s