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Wikipedia[2] and multiple WWII histories date the Schwerer Gustav’s deployment against Sevastopol to June 1942, during the Axis siege of the city.
Wikipedia documents the gun’s weight (~1,350 tonnes), its deployment at the Siege of Sevastopol beginning June 5, 1942, and roughly 48 rounds fired, matching the details given in the documentary.
Details Gustav firing 48 shells at Sevastopol from 5 June 1942.[1]
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