When Mexican general Ráfael Vásquez briefly occupied San Antonio in March 1842, Green recruited the Travis County Volunteers and stood as their captain; the unit was not involved in combat. In response to this and two other Mexican incursions, Texas launched the punitive Somervell Expedition against Mexico; Green served as its inspector general.
When Mexican general Ráfael Vásquez briefly seized San Antonio in March 1842, Green created the Travis County Volunteers and took charge as their captain; they did not engage in combat. In response to this and two other Mexican invasions, Texas launched a punitive expedition against Mexico; Green served as its chief inspector.