American soldiers displaying a German Panzerschreck and the small (but deadly) penetration hole resulting, France, WW2, 1944

So as I understand it, this was like an enhanced, heavier bazooka. And, interesting tidbit here:

Firing the RPzB generated copious amounts of smoke both in front of and behind the weapon. Because of the weapon’s tube and smoke produced, official documentation named the weapon the Ofenrohr ("stove pipe"). This also meant that anti-tank teams were revealed once they fired, making them targets and, therefore, required them to shift positions after firing. This type of system also made it problematic to fire the weapon from inside closed spaces (such as bunkers or houses), filling the room with toxic smoke and revealing the firing location immediately.

https://en.wikipedia.org/wiki/Panzerschreck