Apart from these three abortive operations the High Seas Fleet – unwilling to risk another encounter with the British fleet – confined its activities to the Baltic Sea for the remainder of the war. Jellicoe issued an order prohibiting the Grand Fleet from steaming south of the line of Horns Reef owing to the threat of mines and U-boats. A German naval expert, writing publicly about Jutland in November 1918, commented, "Our Fleet losses were severe. On 1 June 1916, it was clear to every thinking person that this battle must, and would be, the last one".