Ironically, when the M4 first entered service at El Alamein in North Africa, it’s 75mm gun and 93mm of armor was superior to the light and medium German tanks used in that battle. This led American planners to conclude that the Sherman would be good enough to win the war, and there was very little tank development after that time. As heavier (and stronger) German tanks entered the battlefield, the M4 lost its advantage, and became dependent on numbers, artillery support, and air superiority to defeat the superior German designs.