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Br-5 280mm臼砲
Wikipedia definition
1. 280 mm mortar M1939 (Br-5)The 280 mm mortar M1939 (Br-5) (Russian: 280-мм мортира образца 1939 года) was a Soviet heavy artillery piece used during World War II. This mortar was the heaviest Red Army´s field piece. Distinguished by the siege of Berlin, these weapons quicken up the Red Army´s assault on the main German city. With the monstrous weight of shell - 168 Kgs, the blast created a 10 metre deep crater. The weapon had low rate of fire due to muzzle overheating.
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