The Sturmpanzerwagen A7V

The Sturmpanzerwagen A7V was the most prolific tank used by the Central Powers in WWI. This tank was nicknamed "moving fortress" by the allied powers. The A7V used machine guns so it could inflict as much damage on enemy trenches as possible. It also housed canons. The armour on the A7V was 30mm (about 1.18 in) thick, and this tank moved at a top speed of 15km/h.