In September 1931, Japan invaded Manchuria. On 25 February 1933, based on the report by the Lytton Commission, the League of Nations agreed that Japan's invasion had violated Chinese sovereignty. Refusing to accept the organization's judgment, Japan withdrew from the League of Nations the same day. Immediately following, Japan also withdrew from the Washington and London Naval Treaties, thus removing all restrictions on the number and size of her capital ships. "Haruna" was reactivated and assigned to the First Battleship Division on 20 May 1933.