After taking the horses and leaving early on June 11, 1846, a group of these Americans headed to the small town of Sonoma to take control of the town. They collected further men along the way having a total of 33 or 34 men by the time they reached Sonoma near dawn on Sunday morning, June 14, 1846. The group took control of Sonoma without firing a shot. They captured the leaders and officers at that place. Several of the Mexican men, including General Mariano Vallejo, were taken as prisoners, first to Captain Fremont and then to Sutter’s Fort located in what has become Sacramento. About 25 of the men were left at Sonoma, the exact number being unclear.
At some point between dawn on June 14 and noon on June 17, 1846, the remaining men at Sonoma created a flag to stand for their insurgency. The exact timing of the creation is not clear from the documentary records. The flag that was created was a white field with a red stripe at the bottom edge, with a star in the upper left ("hoist") corner and a grizzly bear. The flag soon came to be called the “Bear Flag” and the insurgency came to be called the “Bear Flag Revolt.” The men of the Revolt were named the “Bear Flaggers.”