Confederate Brigadier General Henry Hopkins Sibley envisioned that he would invade New Mexico with his army, defeat Union forces, capture the capital city of Santa Fe and then march westward to conquer California and add it to the territory of the Confederacy. Sibley's first step was to gather an army in El Paso, Texas and lead it north along the Rio Grande with the objective of capturing Fort Craig and the supplies in the fort and defeating the Federal army under Colonel Edward Canby. On Jan 3, 1862, Sibley left El Paso with three regiments and one partial regiment of mounted Texans comprising 2,510 officers and men. Fort Craig, 140 miles (225 km) north of El Paso, was the major obstacle in his path. Canby awaited him there with 3,800 men of whom most were infantry. Only 1,200 of Canby's