 She took part in a variety of training exercises through 22 April, when she was detached from the fleet for cruising trials off Provincetown, Massachusetts.Her squadron joined her there on 15 May for exercises that began five days later.On 26 May, "Mississippi", seven other battleships, and the armored cruiser , embarked a contingent of marines from the 2nd Marine Regiment and carried them to Cuba, where they assisted the Cuban government in suppressing the Negro Rebellion.