During which of these wars did the 1847 Battle of Rio San Gabriel take place?

The Battle of Rio San Gabriel, fought on 8 January 1847, was a decisive action of the California campaign of the Mexican-American War and occurred at a ford of the San Gabriel River, at what are today parts of the cities of Whittier, Pico Rivera and Montebello, about ten miles southeast of downtown Los Angeles.

The small battle resulted in only two deaths and nine wounded casualties on each of the Mexican and American sides. However, the significance of the battle was tremendous. The settlement of Los Angeles and the whole of the territory of southern California was secured from Mexican authority for the remainder of the Mexican-American War.

The site of the battle is now registered as a California Historical Landmark. The memorial, marked by a plaque flanked by two cannons, is located at the corner of Washington Blvd. and Bluff Rd. in Montebello. Volunteers in costume re-enact the battle yearly.