The Angelina Class brigs were the last ships built to replace the older, worn out ships. Three were planned: Angelina, Blanco, and Bosque. Angelina and Blanco were built a year apart; Bosque was not authorized until 1859 and would be completed with different armament.
Angeline commissioned in 1857; Blanco in 1858. They were both armed with fourteen 18lb medium guns and two 18lb long guns, a simple and economical arrangement.
Crew size was 19 Naval Officers, 107 Sailors, 1 Marine Officer and 13 Marines.
Bosque will have the same complement but will be armed with the new 20lb RBLs. Her sisters will receive the upgraded weapons during their scheduled refits in the next decade.