Bunkers

The Germans built over 20,000 of these bunkers. Rather, they used slave labor from the defeated French army to build these. They could build one of these in a week or two. Each bunker would house up to 40 soldiers, with full supplies and air. The steps down came into an armor plated gun hole, so it was suicide to attack directly. The solution was to either fire a gun to make the defender move back and then fire in a bazooka shot or a flame thrower. In the end the allies realized they could just wait long enough and the Germans would come out with hands up in surrender.