Alaxander Hamilton on Militia and Federal Powers in regards to the Posse Comitatus

In Federalist 29 Alexander Hamiliton goes into great detail about the use of the Militia under the new Constitution being debated at the time.  While he argued in favor of the Militia as it stood in Article 1 Section 8 the Anti-Federalist demanded that it be recognized that the Militia of the Whole constituted the entire population and hence, the 2nd Amendment.

His arguments led to the creation of the "Organizaed Militia" and the "Unorganized Militia"

The Organized Militia (select corps of Militia as he put it):

"The attention of the government ought particularly to be directed to the formation of a select corps of moderate extent, upon such principles as will really fit them for service in case of need. By thus circumscribing the plan, it will be possible to have an excellent body of well-trained militia, ready to take the field whenever the defense of the State shall require it. This will not only lessen the call for military establishments, but if circumstances should at any time oblige the government to form an army of any magnitude that army can never be formidable to the liberties of the people while there is a large body of citizens, little, if at all, inferior to them in discipline and the use of arms, who stand ready to defend their own rights and those of their fellow-citizens. This appears to me the only substitute that can be devised for a standing army, and the best possible security against it, if it should exist.''

The Unorganized Militia

"The project of disciplining all the militia of the United States is as futile as it would be injurious, if it were capable of being carried into execution. A tolerable expertness in military movements is a business that requires time and practice. It is not a day, or even a week, that will suffice for the attainment of it. To oblige the great body of the yeomanry, and of the other classes of the citizens, to be under arms for the purpose of going through military exercises and evolutions, as often as might be necessary to acquire the degree of perfection which would entitle them to the character of a well-regulated militia, would be a real grievance to the people, and a serious public inconvenience and loss. It would form an annual deduction from the productive labor of the country, to an amount which, calculating upon the present numbers of the people, would not fall far short of the whole expense of the civil establishments of all the States. To attempt a thing which would abridge the mass of labor and industry to so considerable an extent, would be unwise: and the experiment, if made, could not succeed, because it would not long be endured. Little more can reasonably be aimed at, with respect to the people at large, than to have them properly armed and equipped; and in order to see that this be not neglected, it will be necessary to assemble them once or twice in the course of a year."

He also states the following regarding the POSSE COMITATUS:

In order to cast an odium upon the power of calling forth the militia to execute the laws of the Union, it has been remarked that there is nowhere any provision in the proposed Constitution for calling out the POSSE COMITATUS, to assist the magistrate in the execution of his duty, whence it has been inferred, that military force was intended to be his only auxiliary. There is a striking incoherence in the objections which have appeared, and sometimes even from the same quarter, not much calculated to inspire a very favorable opinion of the sincerity or fair dealing of their authors. The same persons who tell us in one breath, that the powers of the federal government will be despotic and unlimited, inform us in the next, that it has not authority sufficient even to call out the POSSE COMITATUS. The latter, fortunately, is as much short of the truth as the former exceeds it. It would be as absurd to doubt, that a right to pass all laws NECESSARY AND PROPER to execute its declared powers, would include that of requiring the assistance of the citizens to the officers who may be intrusted with the execution of those laws, as it would be to believe, that a right to enact laws necessary and proper for the imposition and collection of taxes would involve that of varying the rules of descent and of the alienation of landed property, or of abolishing the trial by jury in cases relating to it. It being therefore evident that the supposition of a want of power to require the aid of the POSSE COMITATUS is entirely destitute of color, it will follow, that the conclusion which has been drawn from it, in its application to the authority of the federal government over the militia, is as uncandid as it is illogical. What reason could there be to infer, that force was intended to be the sole instrument of authority, merely because there is a power to make use of it when necessary? What shall we think of the motives which could induce men of sense to reason in this manner? How shall we prevent a conflict between charity and judgment?

http://avalon.law.yale.edu/18th_century/fed29.asp