Flamethrower
Germany had engineered a weapon that threw fire over long distances to burn any defenses the enemy threw at them. The flamethrower, literally threw flames.
K-9 Units
The Germans used k9 units to help them win battles. German dogs were strapped with bombs, and trained the dogs to smell and follow the deisel almost everyones tanks produced, including Germany's. The USA had gasoline tanks, and there are stories of the dogs being redirected and blowing up german tanks.
Arado AR 196
The Germans invented a plane that could take off and land in water, giving them a great advantage. This model of plane was used for reconaissance.