approximately 40 cm (16 in) wide before exploding against the inner casemate armor. It tore apart of the superstructure deck and disabled one of the port side casemate guns. Three men were killed and nine were wounded. Admiral Mauve halted the fight against the much more powerful battlecruisers and ordered an 8-point turn to starboard. Late on the 31st, the fleet re-formed for the night voyage back to Germany, with Schleswig-Holstein towards the rear of the line, ahead of , Hannover, and the battlecruisers and . Around 03:00, British destroyers conducted a series of attacks against the fleet, some of which were directed towards Schleswig-Holstein. Shortly thereafter, Pommern was struck by at least one torpedo from the destroyer ; the hit detonated an ammunition magazine, destroying the ship in a tremendous explosion. During the attack, Schleswig-Holstein was forced to turn away to avoid the destroyers' torpedoes. Shortly after 05:00, Hannover and several other ships fired repeatedly at what they falsely believed to be British submarines. Despite the ferocity of the night fighting, the High Seas Fleet punched through the British destroyer forces and reached Horns Reef by 4:00 on 1 June. The German fleet reached Wilhelmshaven a few hours later, where the undamaged dreadnoughts of the and es took up defensive positions. Over the course of the battle, Schleswig-Holstein had fired only twenty 17 cm rounds. Later actions Schleswig-Holstein was put into dock for repairs 10–25 June 1916. The Navy then decided to withdraw the four remaining Deutschland-class ships, owing to their obsolescence and vulnerability to underwater attacks, as demonstrated by the loss of Pommern. Thereafter, the ship was used as a target for U-boats, except during 12–23 February 1917 when she was used as a guard ship. In April Schleswig-Holstein was sent to Altenbruch at the mouth of the Elbe; here she was decommissioned on 2 May. Schleswig-Holstein was then disarmed and assigned to the 5th U-boat Flotilla to be used as a barracks ship in Bremerhaven. In 1918 the ship was moved to Kiel, where she remained for the rest of the war. Inter-war years Following the German defeat in World War I, the German navy was reorganized as the Reichsmarine according to the Treaty of Versailles. The new navy was permitted to retain eight pre-dreadnought battleships under Article 181—two of which would be in reserve—for coastal defense. Schleswig-Holstein was among the ships that were retained, along with