On July 16, 1769, Serra founded mission San Diego in honor of Didacus of Alcalá in a simple shelter on Presidio Hill serving as a temporary church. Tensions with the local Kumeyaay people made it difficult to attract converts. The Indians accepted the trinkets Serra offered as rewards for visiting the new mission. But their craving for Spanish cloth irritated the soldiers, who accused them of stealing. Some of the Kumeyaay teased and taunted the sick soldiers. To warn them away, soldiers fired their guns into the air. The Christian Indians from Baja who remained with the Spaniards did not know the Kumeyaay language.