SM U-156

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SM U-156 was a German Type U 151 U-boat commissioned in 1917 for the Imperial German Navy. From 1917 until her disappearance in September 1918 she was part of the U-Kreuzer Flotilla, and was responsible for sinking 45 ships and damaging two others. She is best known for her attack on Orleans, Massachusetts, the only time during the war that the American mainland was hit by enemy fire. U-156, built by the Atlas Werke in Bremen, was originally one of seven Deutschland class U-boats designed to carry cargo between the United States and Germany in 1916. Five of the submarine freighters were converted into long-range cruiser U-boats (U-kreuzers) equipped with two 15 cm (5.9 in) SK L/45 deck guns, including U-156. They were the largest U-boats of World War I. U-156 was launched on 17 April 1917 and commissioned on 22 August 1917 under the experienced U-boat ace Konrad Gansser, who commanded her until June 1918, following which Richard Feldt took command until the U-156 was lost in September 1918. On 17 January 1918, U-156 entered isolated Naos Bay in the Spanish Canary Islands. She was scheduled to meet with sister U-157 and a small Spanish flagged merchant vessel in an attempt to transit prohibited materials past the British blockade to Germany. The British learned of the meeting through decoded signals and ambushed the U-156 in a failed attempt to sink her. The British submarine HMS E48 actually hit the U-156 with a torpedo but the torpedo had failed to explode.