Churchill was slow (17.5 Mph in its fastest versions), but was tactically very mobile and in the Mk Vll of 1944 was even more heavily armoured than the Tiger 1, even if the layout was inferior. In brief the Churchill was a modernised WW1 type tank designed in 1939/40 for similar conditions to the Western Front of 1915-18. It even had sponsoon mounted guns in the first designs. It progressed via the A20 to the definitive A22 Churchill 1. Design was rushed in to production as the war began badly for Britain.