Four days later, "Sumner" joined Destroyer Division 49, Squadron 13, Flotilla 2 of the Pacific Fleet. Her naval career lasted almost nine years and occurred during a period of relative naval calm. On only four occasions did she depart from her routine of training, maneuvers, and patrols. The first such break came in 1924, when the revolution against the Obregón government in Mexico rose to such intensity that the lives and property of Americans in the country were endangered. Accordingly, on 17 January, while was dispatched to Tampico, "Sumner" and five other destroyers joined in sailing to Veracruz to protect the resident Americans.