Shermans need to move to be effective. They work best in groups of two with one in a hull down postion while the other advances. As soon as you make contact with German armor use your infantry, which should always be infront of a Sherman, to clear an area to get one of the Shermans to the flank of the German tank to take it out. The other Sherman should be hunting forward out of cover and reversing back into it. The second Sherman is the bait to keep the tanks attention while the other one kills it. To get some experance set up a QB with light hills and moderate tree cover. Let the Germans have 4 MarkIVs and take 8 Shermans, either 75's or 76's. Use the cover and move listed above to take out the German tanks.