German Type U 81 submarine

Type 81 was a class of U-boats built during World War I by the Kaiserliche Marine. Type 81 U-boats carried 12 torpedoes and had various arrangements of deck guns. U 81 to U 83 had one 10.5-centimetre (4.1 in) deck gun with 140-240 rounds. U 84 - U 86 were constructed with two 8.8-centimetre (3.5 in) deck guns. In 1917, U 84 - U 86 were converted to a carry one 10.5 cm and one 8.8 cm deck gun and carried 240 rounds.

German Type U 81 submarine

Type 81 was a class of U-boats built during World War I by the Kaiserliche Marine. Type 81 U-boats carried 12 torpedoes and had various arrangements of deck guns. U 81 to U 83 had one 10.5-centimetre (4.1 in) deck gun with 140-240 rounds. U 84 - U 86 were constructed with two 8.8-centimetre (3.5 in) deck guns. In 1917, U 84 - U 86 were converted to a carry one 10.5 cm and one 8.8 cm deck gun and carried 240 rounds.