In 1840, San Antonio was part of the Texas Navy flotilla led by Commodore Edwin Ward Moore which was dispatched to assist Yucatecan rebels that had taken up arms against Mexico.

The Texas Navy was officially formed in January 1836, with the purchase of four schooners: Invincible, Brutus, Independence, and Liberty.

They were identified as being "[p]urposely built and fitted out for use in the slave trade by the United States Consul General in Havana", and AScorpion was typical of the class.

[2] On 26 June 1840, the San Bernard sailed from Galveston with the rest of the flotilla under the command of Commodore Edwin W. Moore.

Crisp and the San Bernard delivered Texas agent James Webb to Veracruz, arriving on 31 May 1841 but were refused landing rights by port officials.

The flotilla reached Sisal on 6 January 1842,[3] For the next couple of months, she participated in the capture of the Mexican merchant vessels Progreso, Dolorita and the Dos Amigos in April 1842.

Later that month, the San Bernard was driven ashore by a gale, and lacking the $500 required to refloat her and have her repaired she became a deserted hulk in Galveston harbor.