...te. We are informed that a difficulty occurred between the Americans and Mexicans at Pino Alto, a few days since. In the fight a twelve-pound howitzer was used. Two Mexicans were wounded. Capt. Helm 's company, the Arizona Guards, have been ordered to that point, and will start on the 16th.--There are few Americans at the mines, and among the Mexican population many Sonorians. The security agai...