I've seen a reference to the St Chamond Mortier de 280 sur Chenilles 1918 self propelled gun being used by the Germans in Russia in 1943. Anbody know if this is correct?
As you can find out from this link http://www.forum.fun-online.sk/viewtopic.php?p=25964&sid=1c435cbf87acbe923227b2830503b08c, and another internet sources, the german army in WW2 used a few units of the 194 mm version in the Eastern Front , (all photos show they removed the six-pointed-star shaped plate with the make name bolted on the front plate of the vehicule)we can assume it would be possible or even likely probable they did use the this variant also. In case you are interested in more pics, I would be glad to contribute.