During trials, "Delaware" was run at full speed for 24 hours straight to prove that her machinery could handle the stress. She was the first American battleship to achieve the feat. Late in 1910, "Delaware" sailed to Europe, followed by a trip to South America early in 1911. She made a further two voyages to Europe in 1912 and 1913, before returning to the US Atlantic Fleet for training exercises that were conducted in the western Atlantic and Caribbean. "Delaware" took part in the Second battle of Vera Cruz in April–May 1914.