The 40th Infantry Division Slavonska was an infantry formation of the Royal Yugoslav Army that formed part of the 4th Army during the German-led Axis invasion of the Kingdom of Yugoslavia in April 1941. It was partly mobilised from the Osijecka military district, and, like all Yugoslav infantry divisions of the time, was a very large and unwieldy formation which was almost entirely reliant on animal transport for mobility. Commanded by Brigadni đeneral , it was largely manned by Croat troops, many of whom saw the Germans as potential liberators from Serbian oppression during the interwar period, and the division also lacked modern arms and sufficient ammunition.