you must have went to PUBLIC FOOL SCHOOL.
Read this article
http://en.wikipedia.org/wiki/First_Texas_Navy
Here you will find the details about the US navy ship seized by Texicans for running guns to Mexico to fight against Texians.
Liberty captured the American brig Durango shortly thereafter and it too was found to be carrying Mexican Army supplies. Around the same time, Captain Jeremiah Brown in the Invincible took the American brig Pocket at the mouth of the Rio Grande, she was carrying contraband as well but her owners informed the United States Navy.[4]Subsequently, the American Commodore Alexander J. Dallas arrested Captain Brown and his crew for piracy when they sailed into New Orleans that May for provisioning. The charges were eventually dropped on the account that all of the seized American ships carried Mexican military stores but a civil suit remained in litigation for years afterward.