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| Axis forces pose next to a knocked out KV-1 tank |
The KV series of tanks in the Soviet arsenal took the invading Germans by surprise, finding their anti tank weapons to be totally ineffective against these heavily armored monsters.
Anecdotally the 37mm Pak Gun became known as the doorknocker as you could sit there all day and it would have no effect on the tank or the crews inside.
https://en.wikipedia.org/wiki/German_encounter_of_Soviet_T-34_and_KV_tanks