In late May, "Princeton" commenced blockading the Lingayen Gulf ports of St. Vincent and Musa and extended the blockade to the entire Gulf from 18–26 June. During the various local disturbances on Luzon, she landed troops at San Fabian on 2–7 November, transported cavalrymen from Vigan to Lingayen, conveyed dispatches, received surrendered arms and carried stores to the Marines at Subic Bay. She met the expedition led by Col. Luther Hare and Col. Robert Howze on 2 Jan. 1900 at Abulug, which rescued American prisoners, including Lt. Gillmore's men from the Siege of Baler. "Princeton" took formal possession of the Babuyan and the Batan Islands on 10–13 January 1900 and continued to patrol off Luzon on 10 February. "Princeton" was later station ship at Iloilo and Cebu from 5 March until 21 June.