While the US is unable to risk any overt involvement in Texan affairs, Jackson hand-selects Putnam to lead a mission in secret: in an aging brig disguised with the Republic of Texas flag, he's to venture into the waters of the Gulf and intercept the trafficking ring, making powerful enemies in the Mexican Navy. Reunited with his old friend Sam Bandy, Putnam teams up with Sam Houston to run the operation, all while some of the most dangerous battles of the revolution are about to begin.