Once described as the worst tank that ever won a war it was built in the States by car factories, railway works and vast purpose-built factories. The M4 Sherman saw service in all theatres of the Second World War as well as in later conflicts in Korea and Israel. It came in many variants. The British gave it a bigger gun, they made 'funnies' that could throw flames or swim ashore and wade rivers or ditches, they were used to lay bridges, clear minefields and even launch rockets. Many Sherman's were sold overseas to countries such as Uganda, Italy, Paraguay, Argentina and Mexico.
John Christopher has written and edited a number of books on Engineering, Military History and Railway and Road Transport, specializing in the life and works of Isambard Kingdom Brunel and being the series editor for Amberley's Bradshaw's Guides series. He has also appeared in Michael Portillo's Great British Railway Journeys television series. In between writing books, he is a balloon pilot and Land Rover fan. He lives in Gloucestershire.