In late 1815 and early 1816, the Lafitte brothers agreed to act as spies for Spain, which was embroiled in the Mexican War of Independence. Collectively they were known as "Number thirteen". Pierre was to inform about the situation in New Orleans, and Jean was sent to Galveston Island, a part of Spanish Texas that served as the home base of Louis-Michel Aury, a French privateer who claimed to be a Mexican revolutionary. By early 1817, other revolutionaries had begun to congregate at Galveston, hoping to make it their base to wrest Mexico from Spanish control. Lafitte visited in March 1817. Two weeks into his stay, the two leaders of the revolutionaries left the island.