For war purposes the regular army contained 16,000 men, chiefly stationed on the western frontiers, while the volunteer militia system of the States permitted of a rapid increase of this force through requisitions upon the governors. The whole naval force in commission, as reported by a congressional committee in January, 1861, consisted of five squadrons of twenty-five ships in various foreign waters, the home squadron of eleven ships stationed in the Gulf of Mexico and along the Atlantic coast, and twenty-eight other ships in various United States ports to be refitted for service, making a total of sixty-four vessels belonging to the navy. To these should be added six store-ships and seven receiving ships, also serving in the navy. The report of the secretary of the navy shows that in March, 1861, the total number of vessels belonging to the navy was ninety, carrying 2,415 guns and a complement of 7,600 men, of which sixty-nine ships were available, and this valuable navy was rapidly increased by construction and purchase. The whole of it remained in the possession of the United States. For construction and preservation of all ordnance there were at least four large foundries, fifteen armories and arsenals, besides a large number of gunpowder mills and manufactories of general army equipments located in the Northern section. Notwithstanding the secession of seven large States, the government still held Fortress Monroe, Harper's Ferry, Gosport navy yard at Norfolk, Forts Sumter, Pickens and many minor strongholds on the Southern coast during the first months of 1861. The oceans were open to its commerce as well as to its war fleets; its resources were magnificent as well as rapidly available, and nothing seemed to obstruct the quick subjugation of the Southern States except the obligations of a sacred instrument—the Constitution of the United States.