Cruiser Mk. VI Crusader during the Bovington Tankfest in 2008. The Crusader is one of the most important tanks used by the British Army in the early parts of World War 2 with more that 5000 units produced. This particular variant is the Crusader Mk. III which is armed with the 57mm QF 6 pounder gun and had to reduce its four-man crew to three in order for it to be able to mount the bigger gun, with the Commander also acting as the Loader. ~Licayan09~ | Tanks. Being tanks.