The Battle of Dogger Bank was a naval engagement on 24 January 1915, near the Dogger Bank in the North Sea, during the First World War, between squadrons of the British Grand Fleet and the German High Seas Fleet.
Following the battle, the British claimed a victory, having sunk the obsolete armored cruiser Blücher, but their modern battle cruiser Lion had to be towed home, and the Germans had learned a lesson that would serve them well at Jutland—a lesson that, unlearned by the British, would cost the Royal Navy dearly. The destruction of the two after turrets of Seydlitz was caused not by a 13.5-inch British shell but by the explosion of ready ammunition and ammunition in transit. From now on, German ammunition would be protected until it was loaded into a gun. In his memoirs, Scheer wrote “However regrettable was the great loss of life on board the Seydlitz through the fire spreading to the munitions chamber of each turret, a valuable lesson had been learned for the future dealing with reserve ammunition, and it was applied in subsequent actions.” The British learned the same lesson at Jutland—at the cost of three battle cruisers.
Sources: "1915: Battle Cruisers Clash," Mission: History, Naval Order of the United States