German gunners with a camouflaged 3.7 cm PaK 35/36 anti-tank gun in combat position in a village, covering the incoming road.

Ready for incoming armor

The German 280-mm railway gun of the "Bruno" series en route to the front, during the invasion of Poland; 1939. 
The 280-mm  (28-cm) schwere Bruno Kanone (E - Eisenbahnlafette (railroad mounting)), was a German railroad gun used during World War II in the invasion of France and Poland. 

280-mm railway gun

German troops manning a 3.7cm Flak 36/37 anti-aircraft gun in the Saarland - south-western part of Germany - are on the alert for an American aerial assault; December 1944. 