During the First World War, the town was bombarded by German warships of the High Seas Fleet, an act which shocked the British (see Raid on Scarborough, Hartlepool and Whitby). Scarborough Pier Lighthouse, built in 1806, was damaged in the attack. A U-boat assault on the town, on 25 September 1916 saw three people killed and a further five injured. Eleven of Scarborough's trawler fleet were sunk at sea in another U-boat attack, on 4 September 1917.