On 5 July 1942, the German battleship Tirpitz was attacked by the Soviet submarine K-21.
Notes on verification
Multiple independent sources (uboat.net, military history wiki, Wikidata) corroborate the date, submarine, and target, though the attack was unsuccessful (torpedoes missed). [cascade flags: wikipedia_dropped_other_sources_exist | tier=unverified indep_score=0.3 clusters=2 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- Attack on the battleship Tirpitz by submarine K-21 (wikipedia)
- https://uboat.net/allies/warships/ship/5126.html (corroboration)
- https://military-history.fandom.com/wiki/Soviet_submarine_K-21 (corroboration)