After the Nazi invasion of the USSR in June 1941, at the personal request of President Franklin Delano Roosevelt in 1942 was set the plan for the level of production – the 1000 medium tanks per month were doubled. It needed to attract new businesses, Pacific Car Foundry End, Fisher, Ford and Federal Machine and Welder. In October 1941, the tank T6 was adopted under the designation M4 and was planned mass production, including 11 plants producing M3 in 1942. In September 1941, the company Fisher offered to organize a second line in Grand Blanc, Michigan. The construction of the tank arsenal in Grand Blanc, based on the production of the M4, started in January 1942, and the manufacture of machinery – in July of the same year, although at the time, Fisher has produced the M4 at one of its plants.

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