While the German Emperor Wilhelm II as commander-in-chief exercised supreme operational command and control of the naval forces, the military staff was split into the Admiralty, the Naval Office, the Naval Cabinet, and the Inspector-General. The command structure had a negative impact on German naval warfare in World War I, as a professional head of the Imperial Navy, similar to the First Sea Lord, was not established until August 1918. After the war and the German Revolution of 1918–19, the Admiralty Staff became subordinate to the Naval Office and was finally disestablished by order of the German President.