In May 1792, Saint-Domingue's French Republican commissioners formed an alliance with Rigaud, allowing him to march his forces into the capital of Port-au-Prince and dissolve the city's restive government of white planters. In August 1793, the new commissioner Sonthonax proclaimed freedom for all slaves in Saint-Domingue, in an effort to counteract a counterrevolutionary white planters' revolt in Le Cap, a British invasion, and a Spanish invasion from neighboring Santo Domingo, as part of the War of the First Coalition. After they abolished slavery, Sonthonax and his fellow commissioner Polverel successfully convinced Toussaint to join the French Republican side of the conflict.