The French campaign of 1940 made a great impression on the command of the US Army and made them realize that the M2 tank being put into production at that time did not meet the requirements of the battlefield. While waiting for the target structure, which turned out to be the M 4 Sherman, the project was commissioned to develop a transitional structure that would enable fairly equal combat with the Pz.Kpfw III and Pz.Kpfw IV vehicles. Yes, in 1941, the first prototype of the M3 Lee tank - called the Grant by the British - was created. The new tank had several advantages (nice armor when introduced to the line, high reliability and strong armament), but it had many disadvantages: low ability to negotiate obstacles, a very high silhouette that made camouflage difficult - especially in desert conditions - and low susceptibility to modernization. As a result of this, from 1943 it was systematically withdrawn from the linear units in favor of the M4 Sherman. However, it was used after 1943 by the Red Army in secondary combat directions and during the fighting in the Pacific by the Americans. Several versions of the car were created in the course of serial production M3 Lee. Chronologically, the first one was marked as M3 and still had riveted armor. A cast-armor version of the M3A1 followed shortly after, followed by the M3A2 with a welded armor. The last version was the M3A5 with riveted armor, but an elongated 37mm barrel.