German armoured units approaching the German-Soviet line of demarcation. June 1941.

Approaching the border

German early Panzer IV in Belgium, May 1940.

The invasion of Belgium

A formation of "topless" PzKpfw I training panzers on the move.  One reason to think twice before dismissing claims by some memorialist that he "learned to drive a tank" (e.g. Guy Sajer) is that the "learning" might have occurred in the form of a try-out on one of these things; exaggeration, but not necessarily absolute untruth.  Best regards, JR.