American Military Insignia, 1800-1851

by J. Duncan Campbell

More quickly than it had arisen, the threat of a war with France abated. Early in 1800 action was suspended under the two acts creating the paper regiments, and the Army was reduced to the regular establishment of four regiments of infantry, two regiments of artillerists and engineers, and two troops of light dragoons.[14] Two years later the antipathy of the new Jefferson administration to a standing army further reduced this establishment to two regiments of infantry and one of artillery. The Corps of Artillerists and Engineers was abolished; a Corps of Engineers was organized to be stationed at West Point and "constitute a military academy"; and the light dragoons were disbanded.[15]

The Jeffersonian theories regarding a strong militia and a small professional army were rudely shaken in 1807 by the Chesapeake-Leopard affair. With war seeming imminent, Congress added to the Regular Establishment, though cautiously "for a limited time," five regiments of infantry, one regiment of riflemen, one of light artillery, and one of light dragoons. The new regiments of infantry were numbered the 3d through the 7th.[16] There was no further preparation for a fight with England until just before war was actually declared. In January 1812, 10 regiments of infantry, two of artillery, and one regiment of light dragoons were added; three months later a Corps of Artificers was organized; and in June provision was made for eight more infantry regiments, making a total of 25.[17] In January 1813, following the discouragements of the early campaigns in the Northwest, Congress constituted 20 more infantry regiments, bringing the total to 45, the largest number in the Regular Establishment until the 20th century.[18] A year later three more regiments of riflemen, designated the 2d through the 4th, were formed.[19]

In March 1814 Congress reorganized both the artillery and the dragoons. The three artillery regiments, which had never operated as such, but rather by company or detachment, were consolidated into the Corps of Artillery; and the two regiments of dragoons, which had never been adequately trained and generally had given a poor account of themselves, were merged into one.[20] The Regiment of Light Artillery remained untouched.

Almost as soon as the war ended, Congress moved to reduce the Army[21] by limiting the peacetime establishment to 10,000 men, to be divided among infantry, artillery, and riflemen, plus the Corps of Engineers. The number of wartime infantry units was reduced to eight, and the rifle units to one. The Corps of Artillery and the Regiment of Light Artillery were retained, but dragoons were eliminated.[22]

By 1821 the prospects of a prolonged peace appeared so good that Congress felt safe in further reducing the Army. Consequently, in that year the number of infantry regiments was cut to seven; the Rifle Regiment was disbanded; the Corps of Artillery and the Regiment of Light Artillery were disbanded, with four artillery regiments being organized in their stead; and the Ordnance Department was merged with the artillery,[23] an arrangement that continued until 1832.

The opening of the West in the decades following the War of 1812 brought an important change in the organization of the Army. Experience having shown that infantry were at a distinct disadvantage when pitted against the fleetly mounted Indians, in 1832 a battalion of mounted rangers was organized to quell disturbances on the northwest frontier,[24] but this loosely knit force was replaced by a regiment of dragoons the following year.[25] The mounted arm had come to stay in the Army.

When the second Seminole War broke out in 1836, a second regiment of dragoons was organized.[26] And, as the war dragged through another inconclusive year, a reluctant Congress was forced to increase the size of existing line units and to authorize an additional regiment of infantry, the 8th. Meanwhile, increasing demands for surveying and mapping services resulted in the creation of the Corps of Topographical Engineers as a separate entity.[27]

Meanwhile, the responsibilities of the Army in the opening of the West continued to increase, and in 1846 the Regiment of Mounted Riflemen was organized to consolidate the northern route to the Pacific by establishing and manning a series of posts along the Oregon Trail.[28] However, the outbreak of the War with Mexico postponed this mission.

At the start of the War with Mexico Congress leaned heavily on volunteer units, with the hard core of the Regulars remaining unchanged. But early in 1847 it was found necessary to add nine regiments of infantry and one regiment of dragoons.[29] Of the infantry unit's, eight were of the conventional type; the ninth was formed as the Regiment of Voltigeurs and Foot Riflemen. Theoretically, only half of this latter regiment was to be mounted. Each horseman was to be paired with a foot soldier who was to get up behind and ride double when speed was needed. In practice, however, none of the Voltigeurs were mounted; the entire unit fought as foot riflemen.[30]

All of these new units proved merely creatures of the war, and the coming of peace saw a reduction to the old establishment of eight regiments of infantry, four of artillery, two of dragoons, and one regiment of mounted riflemen.[31] This organization remained substantially unchanged until 1855.[32]