Elements of the Grand Fleet went to sea repeatedly over the next few months. The 3rd Battle Squadron patrolled the central North Sea in company with the 3rd Cruiser Squadron from 10 to 13 March. The two units again went to sea to sweep the central North Sea from 5 to 8 April. A major fleet operation followed on 11 April, with the entire Grand Fleet sortieing for a sweep of the North Sea on 12 and 13 April. The squadrons returned to their ports on 14 April to replenish their fuel. Another such operation followed on 17 April, which also failed to find any German ships. The 3rd Battle Squadron returned to Rosyth late on 18 April. The fleet sortied again on 21 April, returning to port two days later. The 3rd Battle Squadron, joined by the 3rd Cruiser Squadron, patrolled the northern North Sea from 5 to 10 May, during which a German U-boat attacked the battleships but failed to score a hit.