Over the following six years, the ships had fairly uneventful careers. "Missouri" spent most of the time out of active service, only recommissioning for summer training cruises with midshipmen from the US Naval Academy. In 1914, "Ohio" was sent to Mexican waters to protect American interests in the country during the Mexican Revolution. After the United States entered World War I by declaring war on Germany on 6 April 1917, all three ships were used to train naval recruits for the expanding wartime fleet. Following the German surrender in November 1918, "Missouri" was used to ferry American soldiers back from France, though the other two vessels were not so employed, since their short range and lack of sufficient accommodations would have made them inefficient transports. The three ships remained in active service only very briefly after the war. "Ohio" was decommissioned in January 1919 and "Missouri" and "Maine" followed in September 1919 and May 1920, respectively. All three ships were sold for scrap, with "Maine" and "Missouri" going to the breakers' yard in January 1922 and "Ohio" joining them in March 1923.