At the same time Colorado was girding on her armour for the impending conflict. The governor of the prosperous Territory was William Gilpin, an old army officer, who had spent a large part of his life on the frontier, and had accompanied Colonel Doniphan, as major of his regiment, across the plains, on the expedition to New Mexico in 1846. Colonel Gilpin at once responded to the pleadings of New Mexico for help, by organizing two companies at first, quickly following with a full regiment. This Colorado regiment was composed of as fine material as any portion of the United States could furnish. John P. Slough, a war Democrat and a lawyer, was its colonel. He afterwards became chief justice of New Mexico, and was brutally murdered in that Territory. John M. Chivington, a strict Methodist and a presiding elder of that church, was offered the chaplaincy, but firmly declined, and, like many others who wore the clerical garb, he quickly doffed it and put on the attire of a soldier; so he was made major, and his record as a fighter was equal to the best. The commanding general knew well the plans of the rebels as to their intended occupation of New Mexico, and, notwithstanding the weakness of his force, determined to frustrate them if within the limits of possibility. To that end he concentrated his little army, comprising a thousand regular soldiers, the two regiments of New Mexico volunteers, two companies of Colorado troops, and a portion of the territorial militia, at Fort Craig, on the Rio Grande, to await the approach of the Confederate troops, under the command of General H. H. Sibley, an old regular army officer, a native of Louisiana, and the inventor of the comfortable tent named after him.