 Captain Pascual Cervera was appointed to set up a garrison and serve as military governor; he served from March 1876 to December 1876 followed by Jose Paulin (December 1876 – April 1877), Carlos Martinez (Sept 1877 – Feb 1880), Rafael de Rivera (1880–81), Isidro G. Soto (1881–82), Eduardo Bremon, (1882), Julian Parrrado (1882–84), Francisco Castilla (1884–86), Juan Arolas (1886–93), Caesar Mattos (1893), Venancio Hernandez (1893–96), and Luis Huerta (1896–99).The Spaniards were never secured in Jolo, and by 1878 they had fortified the town with a perimeter wall and tower gates, built inner forts called Puerta Blockaus, Puerta España, and Puerta Alfonso XII, and two outer fortifications named Princesa de Asturias and Torre de la Reina when Sultanate of Sulu formally recognised Spanish sovereignty in middle of 19th century, but these areas remained partially ruled by the Spanish as their sovereignty was limited to military stations and garrisons and pockets of civilian settlements.Troops, including a cavalry unit with its own lieutenant commander, were garrisoned within the protective walls.