In response, Mexican president Antonio López de Santa Anna sent Brigadier General Manuel Micheltorena and 300 men to California in January 1842. Micheltorena was to assume the governorship and the position of commandant general. In October, before Micheltorena reached Monterey, American Commodore Thomas ap Catesby Jones mistakenly thought that war had broken out between the United States and Mexico. He sailed into Monterey Bay and demanded the surrender of the Presidio of Monterey. Micheltorena's force was still in the south, and the Monterey presidio was undermanned. As such, Alvarado reluctantly surrendered, and retired to Rancho El Alisal. The next day Commodore Jones learned of his mistake, but Alvarado declined to return and instead referred the commodore to Micheltorena.