Bazooka
This rocket launcher was made early on in WWII, and was givin to soldiers in 1942. It was used mainly as a anti-tank weapon.
Grenade
The Mark II grenade was used close up on targets. It was dangarous for both the attacker and the victim.
Anti-Tank mines.
Mines have been used for along time in war. These mines werent any problem for infantry, but they were a huge problem for tanks.