Baron Franjo Jelačić Bužimski was a Croatian military officer and nobleman, a member of the House of Jelačić. He began his service in the Habsburg army as a Grenz infantry officer and fought against the Ottoman Empire. During the French Revolutionary Wars he received promotion to the rank of general officer and won an outstanding victory at Feldkirch. His later career proved that his martial abilities were limited. He twice led independent division-sized forces in the Napoleonic Wars, with unhappy results. He was Proprietor (Inhaber) of an Austrian infantry regiment from 1802 until his death.

The Battle of Feldkirch saw some French corps led by André Masséna attack a weaker Austrian force under Franz Jellacic. Defending fortified positions, the Austrians repulsed all of the French columns, though the struggle lasted until nightfall. This and other French setbacks in southern Germany soon caused Masséna to go on the defensive. The War of the Second Coalition combat occurred at the Austrian town of Feldkirch, Vorarlberg, located 158 kilometres (98 mi) west of Innsbruck.