Following the success of assault guns on the World War II Eastern Front, the Hungarians developed their own model, based on the chassis of the Turán tank. There were two designs, the 44M Zrínyi I, incorporated a long 43M 75mm gun, but it did not pass the prototype stage. The 40/43M Zrínyi II was armed with a 40M 105mm L/20 howitzer. The Zrínyi II design was a traditional infantry support vehicle. The Zrínyi I was hoped to fulfill an anti-tank role.