Baron Franjo Jelačić Bužimski (English: Franz Jellacic / Francis Yellachich of Buzhim; German: Franz Jellačić von Buzim; Hungarian: Ferenc Jellacsics de Buzim; 14 April 1746 – 4 February 1810) was a Croatian military officer and nobleman, a member of the House of Jelačić.

During the French Revolutionary Wars he received promotion to the rank of general officer and won an outstanding victory at Feldkirch.

Born in 1746 at Petrinja in the Kingdom of Croatia of the Habsburg Monarchy, Jelačić became an officer cadet in the 1st Banal Grenz Infantry Regiment in 1763.

Still serving with the Grenz infantry of the Habsburg monarchy army, Jelačić was elevated to the rank of Oberst (Colonel) in 1794.

[3] For this remarkable feat, he received promotion to Feldmarschall-Leutnant (Lieutenant Field Marshal)[4] and was awarded the Knight's Cross of the Military Order of Maria Theresa.

[5] In 1801, his wife Ana Portner von Höflein gave birth to their son Josip Jelačić, who also became a general and supported the Austrian regime during the Hungarian Revolution of 1848.

At this time, Jelačić commanded 15,000 troops organized in 16 infantry battalions, six Jäger companies, and six cavalry squadrons.

[8] On the 12th, Mack reorganized his army, making Jelačić one of four corps commanders, the others being Johann Sigismund Riesch, Franz von Werneck, and Karl Philipp, Prince of Schwarzenberg.

One thousand of his cavalry, under General-Major Christian Wolfskeel von Reichenberg and Colonels Wartensleben and Kinsky, made a remarkable march through Bavaria and reached Bohemia in safety.

[12] Another portion of the Vorarlberg force under Prince Viktor Rohan tried to reach Venice but was caught 40 kilometres (25 mi) short of its goal.

[1] Brought out of retirement for the War of the Fifth Coalition, Jelačić took command of an infantry division in Johann von Hiller's VI Armeekorps.

After the Austrian defeats at the battles of Abensberg, Landshut, and Eckmühl from 20 to 22 April 1809, Hiller retreated rapidly east and Jelačić was ordered back to Salzburg.

Without sufficient artillery and cavalry support, Jelačić's 9,000 troops were overwhelmed, suffering 423 dead, 1,137 wounded, and 4,963 captured.