The Militia is not an army (the Constitution, for example, distinguishes between it and "troops"). The principal quartermaster's for it were the men's wives and mothers if necessary, etc. John Taylor of Caroline, one of Thomas Jefferson's favorites, observed that it was the military force of the People of the United States... available to the State and General Governments as necessary for certain purposes.
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The Governors are commanders-in-chief of the Militia of their States, and the President is their Commander-in-Chief upon calling them forth for the purposes of enforcing the laws of the Union, resisting insurrection, or repelling invasions; besides which they might be employed for the purposes of war. The Constitution gives to the President the power to call forth the Militia into actual service. And for Congress to provide for the organization, arms, discipline, and for the modes of governing them when in the service of the United States, etc. (for which the laws in force pre-1860 generally allowed them the same pay, rations, etc. as troops).
As a manpower reserve, it might be noted during the Revolution, Besides employing large numbers of militia in Militia units in short periods of active service; when voluntary enlistments in the Continental army cratered after 1776-77, the Continental Congress and the States employed militia drafts as "levies" to fill the Continental Army regiments... the drafted men ordered by their Governors (commanders-in-chief) to serve in the ranks of the Army and abide its officers for several months at a time. They not being enlisted men, they were not due the army pay, clothing, etc. that enlisted men were. Consequently, many Continental army units, at any given time, had half or more of their rank-and-file provided by militia levies. Sometimes whole Army units were composed of such levies, except for the officers, as was the case with the North Carolina brigade at Eutaw Springs, etc. etc. Given material shortages in the Army the levied men were paid commutations for providing their own musket or firelock when presented into the army, etc.
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Some comments by some early Presidents regarding supporting the militia as a potential force of national defense...
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The US Militia Acts of the 1790s directed the Militia generally to discipline by Steuben's regulations for the infantry of the United States at their musters. It was generally intended that every five company battalion of Militia would form a "light" company; preferably of the most active and suitable fellows for that purpose. From May, 1820 the US law required them to discipline by the same modes employed by the Army. The overwhelming number of common or "regular" militia units from the 1790s to 1850s, or "beat" units comprised of men (all aged 18 to 45 by most of the laws) in a given territorial bound or beat, were disciplined as "infantry."
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The Volunteer militia companies etc. were generally "light infantry," rifle, cavalry or artillery companies. It was popular for these volunteer militia to wear particular uniforms, and otherwise copy some of the appearance and modes of troops, at the men's own expense, as by most State laws this was the cost of associating with such versus being enrolled in one's common beat company, where uniforms were unknown beyond the officers (maybe) and esprit de corps was meaningless as it was simply a legal obligement.
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There was no pay for common militia duty/musters, etc. Only for active service to their State or the United States per the laws in effect.
There was complaint in the 1830s-40s that Scott's Army tactics were rather too prolix and complex for country militia to easily master in only a few musters. There were consequently produced various "abstracts" of basics published. Hardee's rifle and light infantry tactics of the late 1850s was considered unsuitable for regular militia, which comprised men 18-45 irrespective of their health or strength; and who might not be able to drill "at the double-quick" time, etc. But some volunteer militia corps, like Elmer Ellsworth's Chicago Zouaves, selecting only physically fit men, mastered it, and their drills were considered a popular gymnastic exhibition...
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By the 1860s in a larger number of the States, the "regular" militia was rather moribund or even disorganized in spite of the laws on the books; with the "volunteer" militia instead further organized, etc. in a manner like troops, and their foremost already familiar with Hardee's tactics. Many of these volunteer militia corps, irrespective of their discipline, were mustered into Army service as volunteer "troops" in the Armies in 1861-62. The fact they already had uniforms and military equipment was handy...
When the US administration (and the CS administration during the war's first year) sent quotas for volunteer troops to the States, where the number of volunteers from a given district were wanting (each company and regiment entering Govt. service had to meet the minimum strength), a militia draft would be held; and the drafted men ordered by their Governors (their commander-in-chief) to enlist in the volunteer unit...and from there to be mustered into US or CS service with it. There was a MASSIVE attempt in the 1860s to do everything possible to forestall militia drafts to meet troop quotas... namely in the form of local/State/federal bounties, etc.
From Vermont, April, 1861...
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Considering the general disorganization of the regular militia before the war, during it, even when Militia was called forth by the Governors for State active service, it was frequently by volunteers first, forming new companies at full strength for the purpose. From Missouri in August, 1861...
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Or where the militia organization was imperfect, without time to perfect/organize it in the manner of the laws in force; a State's militiamen might be employed among "citizen volunteers" or "home guards" like the army of 20,000 "squirrel hunters" called forth by the Governor of Ohio for local defense during the Confederate invasion of Kentucky in late 1862...
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The Union Army also included many militia units serving as such in US service, besides the regular and volunteer troops. For example the 75,000 Militia called forth by the President in April, 1861 after Fort Sumter (soon joined by the call for Volunteer troops). The Militia draft of 300,000 Militia for nine-months in August, 1862; some of which units were engaged in combat at Fredericksburg, Chancellorsville, Gettysburg and Port Hudson. During the Gettysburg Campaign, the US formed a principally militia army in the Department of the Susquehanna for the defense of Harrisburg. Gen. W.F. Smith commanded a division of militia in the pursuit of Lee's army to the Potomac after Gettysburg.
Further militia calls in 1864, etc. including a large force for 100 days US service, etc. to replace rear area troops to move to the front with General Sherman's armies in the west.
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Further, with enlistments for volunteer army service declining, and with a certain amount of resistance within the Northern States to the militia calls of the President and Governors (only some 90,000 of the 300,000 called forth by the President in August, 1862 actually rendezvoused and mustered into US service) the US laws established in 1863 the "national draft" to aid the States in enrolling their militia, and for potential drafts of men to meet US quotas for volunteer troops and encourage voluntary enlistments. Before the close of the war, the national draft law and the State and local boards had produced the following troops...(or commutation payments in lieu of active service)...
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At the close of the fighting in mid-1865 the national draft act had aided the States etc. materially, as 2.5 million men enrolled for State/federal drafts available for calling forth to combat State or local disorders/riots, and finish off the Confederacy (or its potential allies) if necessary...
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Jumping ahead several decades, after 1903 the old regular militia laws were replaced by the modern Dick Act, dividing the militia between the "organized" and "unorganized." The principal part of the "organized" militia comprising the "National Guards" of the States, who are organized etc. similarly to US troops generally. Since 1933, the National Guardsmen are dually enlisted in both the organized militia of their States (like the "Florida Army National Guard" etc.) and the Army as part of the Army Reserve component called the "National Guard of the United States"...
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Consequently the modern NG's might be employed by their Governors or the President as Militia, or by the President as US Troops upon activation as Army reservists, etc.