Little is known about Admittance, an American merchant brig operating along the California coast during the Mexican War. The United States sloop of war Portsmouth seized this vessel on April 8, 1847 at San Jose, California, for "trading with the enemy."
Comdr. John B. Montgomery, Portsmouth's, commanding officer took the prize into the Navy. Under the command of Lt. Joseph Warren Revere, she served until May 6, 1848. No record of her fate thereafter seems to have survived.[1]