The Battle of Natividad The Battle of the Natividad (November 16, 1846). The Battle of the Natividad took place on November 16, 1846 in the Salinas Valley, in present day Monterey County, California, during the California Campaign of the Mexican–American War, between United States organized California militia and loyalist Mexican militia. While San Juan Bautista was the marshaling area for Fremont’s forces, a scouting party of 50 men was attacked by a 15 man force of Mexican Californios on the Rancho Natividad in the Salinas Valley. "The Battle of the Natividad (November 16, 1846). The Battle of the Natividad took place on November 16, 1846, in the Salinas Valley, in present-day Monterey County, California, United States, during the California Campaign of the Mexican–American War, between United States organized California militia and loyalist Mexican militia. Battle of Natividad, by the California State Military Museum. The Battle of the Natividad took place on November 16, 1846, in the Salinas Valley, in present-day Monterey County, United States, during the California Campaign of the Mexican–American War, between United States organized California militia and loyalist Mexican militia. While San Juan Bautista was the marshaling area for Fremont’s forces, a scouting party of 50 men was attacked by a 15 man force of Mexican Californios on the Rancho Natividad in the Salinas Valley. The Battle of the Natividad took place on November 16, 1846, in the Salinas Valley, in present-day Monterey County, California, during the California Campaign of the Mexican–American War, between United States organized California militia and loyalist Mexican militia.