In the 1920s and 1930s Citroën developed a long line of half-tracks based on the Kégresse patent.

But before mass production could take place, Citroën went bankrupt and its new owner, Michelin, chose to focus on the civilian markets.

[1] During World War II, the Germans used these captured half-tracks extensively under the name leichter Zugkraftwagen 37 U304(f) to tow various anti-tank guns.

Panzerdivision (which in 1944 was stationed near Caen in Normandy) suggested converting captured French vehicles.

He ordered the conversion of available Unic half-tracks into leichter Schützenpanzerwagen (light armoured personnel carriers).