SM U-30 was one of 329 U-boat submarines serving in the Imperial German Navy in World War I. She engaged in commerce warfare as part of the First Battle of the Atlantic. U-30 is significant for the torpedoing of the US tanker Gulflight on 1 May 1915 west of Scilly.
Torpedoing of Gulflight
The particular mission when Gulflight was attacked commenced 24 April 1915. On 28 April U-30 intercepted the collier Mobile which she sank by gunfire after allowing the crew to escape. On 29 April she similarly sank the 3,220 GRT Cherbury. 30 April she ordered the steamer Fulgent to halt, but when the ship failed to do so fired a shot into the ship's bridge, which killed the captain and quartermaster. The ship stopped and the rest of the crew were allowed to escape before the ship was sunk by explosive charges placed inside. That afternoon, the 3,102 GRT Svorno was stopped and sunk. On 1 May the grain carrier Edale and French ship Europe were sunk. A Dutch ship was stopped and, as a neutral, permitted to continue at a point some north west of the Scilly Isles, but the submarine was spotted at this point by a steam drifter, Clara Alice which reported her position to a naval patrol.
The patrol ships and started to hunt for the submarine, but succeeded only in intercepting the US-flagged Gulflight, which they took under escort. The escort proved something of a disadvantage to Gulflight because she was obliged to slow down for the patrol and then, under international law, as a ship escorted by armed vessels became a legitimate target for attack. U-30 spotted the convoy and fired one torpedo at Gulflight, before noticing that she was flying an American flag. The submarine then broke off the attack in accordance with her instructions not to attack neutral vessels.
Gulflight survived the attack, although two members of the crew drowned while evacuating the ship and the master Captain Gunter died later that night from a heart attack. The ship was towed to Crow Bay and later repaired. News of the event would be overshadowed a few days later by the sinking of but the incident, together with the attack on Lusitania and another ship, Cushing, formed the basis of a formal complaint from the US government to Germany. Although the United States remained officially neutral in the ongoing hostilities, it reached agreement with the German government that further attacks by submarine would be strictly in accordance with "cruiser Rules" as defined by international law.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate20 February 1915Cambank3,112Sunk20 February 1915Downshire337Sunk28 April 1915Mobile1,905Sunk29 April 1915Cherbury3,220Sunk30 April 1915Fulgent2,008Sunk30 April 1915Svorono3,102Sunk1 May 1915Edale3,110Sunk1 May 1915Europe1,887Sunk1 May 1915Gulflight5,189Damaged3 May 1915Minterne3,018Sunk26 October 1916Lysland1,745Sunk1 November 1916Brierley Hill1,168Sunk11 April 1917Saxo711Sunk11 April 1917Nancy1,325Sunk11 April 1917Star818Sunk11 April 1917Sylfiden796Sunk12 April 1917Kolaastind2,368Sunk13 April 1917Bokn336Sunk13 April 1917Frixos2,471Sunk13 April 1917Gama107Sunk13 April 1917Glenlora805Sunk13 April 1917Zara1,331Sunk14 April 1917Fjeldli954Sunk15 April 1917Paris1,634Sunk16 May 1917Middlesex7,265Sunk23 May 1917Freden166Sunk16 July 1917Cyrus293Sunk28 July 1917Atlas2,068Sunk
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