 She took part in the Battle of the Gulf of Riga in August, where she engaged a Russian gunboat and bombarded Russian positions ashore.While "Bremen" and a pair of torpedo boats were on patrol in December 1915, one of the torpedo boats entered a Russian minefield, striking a mine.When "Bremen" moved to assist the stricken vessel's crew, she, too, struck a pair of mines and sank, taking most of her crew with her.