The Imperial and Royal or Imperial Austrian Army (German: Kaiserlich-königliche Armee, abbreviation "K.K. Armee") was strictly speaking, the armed force of the Holy Roman Empire under its last monarch, the Habsburg Emperor Francis II, although in reality, it was nearly all composed of the Habsburg army. When the Holy Roman Empire was dissolved in 1806, it assumed its title of the Army of the Austrian Empire under the same monarch, now known as Emperor Francis I of Austria.
The name "Imperial-Royal Army" was used from 1745, as "Royal" referred to the Apostolic Kingdom of Hungary, which was not part of the Holy Roman Empire, but under Habsburg rule.
The key feature of the army of the Austrian Empire during the Revolutionary and Napoleonic Wars (1792-1815) was that, due to the multi-national nature of the territories, regiments were split into German units (which included Czech-troops recruited from Bohemia, Moravia and Silesia, Polish and Ukrainian units recruited from the territory of Galicia, Flemings and Walloons territory of the former Austrian Netherlands, and Italians) and Hungarian units (which included troops from Croatia and Transylvania).
Conscription resulted in elements of untrained men in every battalion, a problem exacerbated by incoherent training across the regions. The army was beset by constant government frugality and several reorganisations. A Militär-Hof-Commission sat for six years from 1795 (known as the Nostitz-Rieneck commission and from 1798, Unterberger) to overhaul the kit, producing the simpler 1798-pattern uniform, the famous crested helmet and a standard musket, copied from the French 1777 pattern. Although some regiments were disbanded in 1809 following the loss of their recruiting-grounds, others were allocated new areas yet kept their old designations; for example, the Walloon regiments whose recruiting areas were transferred to Galicia.