The Battle of San Pasqual was a military encounter that occurred during the Mexican-American War in what is now the San Pasqual Valley community of the city of San Diego, California. The series of military skirmishes ended with both sides claiming victory, and the victor of the battle is still debated.In December 1846, General Stephen W. Kearny’s US Army of the West engaged a small contingent of Californios and Mexican Lancers.