Beginning in May, 1863, Gen. Prince John Magruder of Houston began a systematic reduction of Confederate forces at Sabine Pass, and that at a time that he knew an attack at Sabine Pass was perhaps imminent. Several companies of Spaight's Bn. were transferred to Opelousas, La., where Gens. Nathaniel Banks and W. B. Franklin led an invasion up the Bayou Teche.