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Frankfurt rammed and sank the german U-Boat UB 89 in error on the 21 October 1918 in Kiel-Holtenau. Source: Harald Bender: Die UB-Boote der Kaiserlichen Marine 1914 - 1918. p. 167. You can see also: [1]. So long URTh (talk) 13:49, 29 January 2016 (UTC)[reply]