Once described as the 'worst tank that ever won the war', the Sherman was never going to be the equal of the German heavies in a direct tank-on-tank confrontation. But it was tough, reliable and built in such prodigious quantities that it became a war winner. The Sherman came in many variants, and was converted for other uses by the Allies. The Brits gave it a bigger gun, made 'funnies' that could wade through water, build bridges, clear minefields and even spitfire. The Sherman lasted in service into Korea with the Americans and many were sold overseas to Israel, Uganda, India, Paraguay, Argentina and Mexico, with the last in service in Chile. John Christopher tells the story of the M4 Sherman, using both new and archive images to show the most famous tank in the world in all its guises and variants.