, 1847 The Mexican War brought the replacement of the militia system—"the great bulwark of the national defense"—with the volunteer system, a major shift in United States national military policy. The bulk of the soldiers in the war of 1812 came from the militia; for the Mexican War, the United States mobilized 116,000 soldiers, of whom 42,000 served in the Regular Army, 13,000 in the Militia and 61,000 in the Volunteers. Of the volunteers, only about 30,000 served in Mexico. The declaration of war with Mexico, May 13, 1846, was followed by large military appropriations, an increase in the regular army, and authorization for the president to raise 50,000 volunteers for a term of one year or the duration of the war. The volunteers would serve either as cavalry, artillery, infantry or riflemen, furnish their own clothing and, for the cavalry, their own horses and
horse equipment, but be armed by the government. They would serve under the
articles of war, and receive all the emoluments of the Regular Army, except clothing, for which the enlisted men would receive compensation, plus 40 cents per day for the risk of the horses furnished. The volunteers would be organized in companies, battalions or regiments before volunteering; the officers appointed according to the laws of the several states that offered volunteers. The president was authorized to organize the volunteers into brigades and divisions if required, and appoint the staff, field and general officers among the several states. The states closest to Mexico were asked to immediately provide 20,000 one-year volunteers, other states to have 25,000 ready for later call, with about one-third of the volunteer units to be cavalry. The state quotas were easily filled. Volunteer units were much more easily filled than the increase in the Regular Army also authorized by Congress. The short-term enlistment and the easy discipline of the volunteers won out in comparison with the Regular Army's five-year enlistment and strict discipline. Thirty regiments of one-year volunteers were mustered, but in November 1846 it was obvious that their enlistment would expire before the end of the war. The President issued a call for volunteers to serve for the duration of the war and at the end of 1847, 22 regiments and five battalions of infantry, one regiment and five battalions of mounted troops and three companies of artillery had been organized. Several regiments were mustered later, making a total of 32 regiments "for the duration". By the end of May 1847, when the American army under
Winfield Scott stood at
Puebla, Mexico, during its advance from
Vera Cruz, the enlistment of the one-year volunteers in his army expired and seven volunteer regiments of 3,700 soldiers departed for home. The army had to halt and wait two months for fresh troops from the states. For the entire duration of the war regulars and volunteers showed a marked degree of antipathy towards each other. At
Matamoros in 1846, about two thousand "gentlemen" who had enlisted as private volunteers mutinied because they had to draw water and chop wood, something they expected the Regular Army to do for them. Regular officers did not serve in the volunteers. Although the volunteers had excellent
field officers, they had very few competent
company officers, most of whom had very little or no military experience. They were either commissioned by the state governors for political reasons or elected by the enlisted men of the company. The reverse was true for the Regular Army, where few of the field officers were trained at West Point and many were ineffective through old age or infirmity. ==American Civil War==