The Sd.Kfz. 251 (Sonderkraftfahrzeug 251) half-track was a WW2 German armored fighting vehicle designed by the Hanomag company, based on its earlier, unarmored Sd.Kfz. 11 vehicle.
The Sd.Kfz. 251 was designed to transport the schützen (German mechanized infantry) into battle. Sd.Kfz. 251s were the most widely produced German half-tracks of the war, with at least 15,252 vehicles and variants produced by various manufacturers, and were commonly referred to simply as "Hanomags" by both German and Allied soldiers.
The early production models of this vehicle were issued to the 1st Panzer Division in 1939.
These vehicles were meant to enable schützen to accompany panzers and provide infantry support as required. In practice, there were never enough of them to go around, and most schützen units had to make do with trucks for transport.
In August 1943, Romania acquired a total of 27 armored half-tracks, of both the 251 and 250 types  followed in 1944 by 251 type and other types of armored cars to convert two cavalry divisions into armored or mechanized divisions.
The Army of the Independent State of Croatia received 15 Sd.Kfz. 251 in spring 1944 and the Ustashe Militia received 12 in autumn 1944.