Castro’s last stand: the California adobe where Mexican resistance crumbled

José Castro’s Adobe Stronghold Against American Annexation

José Castro wanted California to rule itself. Born in 1808, he built his adobe house in San Juan Bautista in 1841 and ran his troops from there.

First, he fought Mexican control. Then, when American John Frémont camped nearby with a U.S. flag in 1846, Castro sent 200 men to face him down. Soon after, American settlers took Sonoma and claimed their own California Republic.

Castro led the fight against both sides from his adobe home base. When the U.S. won, he left rather than give up his Mexican rank. The Castro-Breen Adobe still stands today, a silent witness to one man’s stand for California freedom.

Castro Built a Military Command Center in San Juan Bautista

José Castro put up his adobe house on San Juan Bautista Plaza in 1841. He needed a strong base to run military operations across Northern California.

The house became the center for his work as Commandante General, with his secretary living on the property. Locals called the town San Juan de Castro for a while because his family had so much influence there.

His father, José Tiburcio Castro, ran the Mission San Juan Bautista after 1834.

Castro worked to protect Californio interests from both Mexican governors and American land-grabbers.

His Rebellious Streak Started Early Against Mexican Control

Castro got arrested in 1830 for standing up to the Mexican governor of California. This started his pattern of pushing back against outside control.

By 1835, he worked as acting governor and pushed hard for California-born governors. He teamed up with his brother-in-law Juan Alvarado in 1836 to kick out Governor Gutiérrez.

They even brought in Tennessee volunteers led by Isaac Graham to help.

Castro took the title of Commandante General and briefly led an independent California before making a deal with Mexico for more self-rule.

Frémont Broke His Promise and Stirred Up Trouble

John Frémont showed up near Monterey with 60 armed men in March 1846 after promising to stay in San Joaquin Valley for winter. Castro told Frémont to leave California right away, seeing the armed Americans as a threat.

Frémont refused and took his men up Gavilan Peak overlooking San Juan Bautista on March 6. The Americans built a rough fort from logs and raised the United States flag, openly challenging Mexican authority.

U.S. Consul Thomas Larkin tried to smooth things over between Castro and Frémont.

The Mexican Army Surrounded the American Trespassers

Castro gathered about 200 soldiers at San Juan Bautista when he saw what Frémont was doing on the peak.

He put his Mexican forces at the bottom of Gavilan Peak, cutting off any American advance while avoiding a direct attack. Both sides sent messages back and forth for four days, some friendly, some hostile.

Castro officially asked Frémont to leave while carefully avoiding an all-out military clash.

A Fallen Flag Convinced Frémont to Retreat

The American flag on Gavilan Peak blew down in the wind on March 9. Frémont took this as a bad sign and broke camp that same afternoon.

His American group snuck away during the night toward Monterey, then kept going north to Oregon Territory. Castro forced the Americans out without firing a single shot.

Frémont later said they left “slowly and growlingly,” clearly unhappy about having to back down from the fight.

American Settlers Declared Their Own Republic

On June 10, 1846, American settlers grabbed 170 Mexican government horses being moved to Castro’s headquarters. Four days later, about 30 American settlers took over the town of Sonoma under William Ide’s leadership.

The rebels caught General Vallejo and took weapons from the Sonoma Barracks.

They raised the Bear Flag and announced an independent California Republic, worried that Castro planned to kick all Americans out.

Castro asked Californios to defend their country while promising safety for foreigners not involved in the revolt.

The Mexican Army Mobilized to Crush the Rebellion

Castro organized Mexican forces from his headquarters at Santa Clara.

Captain Joaquín de la Torre led 50-60 militia north across San Francisco Bay to San Pablo on June 23. Another 100 Mexican soldiers showed up at San Pablo on June 27 to fight the Bear Flag forces.

Castro ran military operations aimed at taking back Sonoma and restoring Mexican control over northern California. Mexican forces tried to save two captured rebels but found out the Americans had already killed them.

The Only Battle of the Revolt Ended in Mexican Retreat

Mexican forces under de la Torre ran into Bear Flag militia near Olómpali north of present-day Novato on June 24. About 70 Mexican soldiers fought with American volunteers in the only real battle of the Bear Flag Revolt.

The Americans took positions in a grove and opened fire when Mexican cavalry charged, killing one soldier and wounding another.

The Mexican forces pulled back to San Rafael after taking casualties, unable to push the Americans out of their strong position.

American Naval Forces Changed the Whole Game

Commodore John Sloat landed troops at Monterey on July 7, 1846, and raised the American flag, claiming California for the United States.

Castro heard about Monterey’s fall while at San Juan on July 6 and realized the Mexican military position had collapsed.

Frémont came back to San Juan Bautista in November as a U.S. Army lieutenant colonel, collecting horses and supplies for his 428-man California Battalion.

American forces took northern California ports and towns with little bloodshed as Mexican authority fell apart.

Castro Refused to Surrender to American Forces

Castro and Governor Pío Pico wrote goodbye messages before running away separately rather than giving up to American forces.

On August 9, 1846, Castro issued a statement from Campo en la Mesa promising endless resistance: “never, never over our hearts.”

He called on Californios to keep up the “same ardor to sustain sacred rights of our liberty and independence” despite military defeat.

Castro fled to the Mexican state of Sonora as Commodore Stockton’s forces walked into Los Angeles without a fight on August 13.

His Fight for California Continued from Mexico

Castro left for Baja California after the U.S. claimed his homeland, settling in Sinaloa, Mexico.

He made a brief trip back to Alta California in 1848 after the Mexican-American War ended with the Treaty of Guadalupe Hidalgo. He never gave up his Mexican citizenship or military rank even though California became U.S. territory.

By 1853, he got appointed governor and military commander of Baja California, continuing to serve Mexico.

Castro sold his San Juan Bautista adobe to Patrick Breen of the Donner Party in 1848 before going back to Mexico for good.

Visiting Castro, Jose, House, California

The Castro-Breen Adobe at 19 Franklin Street in San Juan Bautista shows where José Castro commanded Mexican forces during the 1846 Bear Flag Revolt.

You can visit daily from 10 a.m. to 4:30 p.m. for $3 (kids free). Book guided tours Tuesday through Sunday by calling 831-623-4881.

Check out First Saturday Living History Days monthly with costumed actors. The adobe is one of four historic buildings in the park.

This article was created with AI assistance and human editing.

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