1841-11: First Organized American Group Penetrates California for Settlement

…And in 1841, the first organized American group penetrated California for the purpose of settlement when Bidwell-Bartleson party crossed the Sierra. They were the vanguard of a different breed of men who were ready to take aggressive action to bring about American conquest. Vallejo, who had supported Alvarado in the Graham affair, now felt the need for more drastic measures. He petitioned the Mexican government to send a new governor, accompanied by a strong force of well-trained troops and a contingent of colonists, to counteract foreign immigration"

Fink, Augusta. Monterey: The Presence of the Past. San Francisco: Chronicle Books, 1972. p. 76