This tank was the only tank produced and used by Germany during World War I.
Panzer I
Mark I
A7V
J38t
The A7V was the only tank produced by the Germans during the war that they used during operations. Box-shaped, large, and cumbersome, the British nicknamed it the "moving fortress." It carried a 57mm gun, six machineguns, and boasted a crew of 18. However, its sheer size only allowed a speed of 9 mph. Only 20 were ever produced.