RE: Evidence that the founders didn't expect the members of the miltia to provide their own arms.
The town shall at the expense of the town, shall provide for, and furnish the militia with arms and equipment, which shall remain the property of the town.
--An act for regulating and governing the Militia of the Commonwealth of Massachusetts passed June 1793
Origins of the 2nd amendment:
Before the United States Constitution or Bill of Rights existed, most of the 13 original states had clauses in their constitutions protecting the right to keep and bear arms. When the time came for Congress to draft the Bill of Rights, states submitted clauses from their constitutions that they thought should be added to the Federal Bill of Rights.
Three predominant arms clauses existed at that time (many states had word-for-word copies from other state constitutions, and the redundant versions are not mentioned herein.)
Pennsylvania (1776): That the people have a right to bear arms for the defence of themselves and the state; and as standing armies in the time of peace are dangerous to liberty, they ought not to be kept up; and that the military should be kept under strict subordination, to, and governed by, the civil power. (Simplified in 1790 to read “The right of the citizens to bear arms in defence of themselves and the State shall not be questioned.”)
Vermont (1777): That the people have a right to bear arms for the defence of themselves and the State -- and as standing armies in time of peace are dangerous to liberty, they ought not to be kept up; and that the military should be kept under strict subordination to and governed by the civil power.
Massachusetts (1780): The people have a right to keep and to bear arms for the common defence. And as, in time of peace, armies are dangerous to liberty, they ought not to be maintained without the consent of the legislature; and the military power shall always be held in an exact subordination to the civil authority, and be governed by it.
North Carolina (1776): That the people have a right to bear arms, for the defence of the State; and, as standing armies, in time of peace, are dangerous to liberty, they ought not to be kept up; and that the military should be kept under strict subordination to, and governed by, the civil power.
We can see in these state constitution clauses the conjoined purposes as viewed by the people at the time the 2nd Amendment was drafted.
Five states that ratified the Constitution sent demands for a Bill of Rights to Congress. All these demands included a right to keep and bear arms. The relevant parts of these written demands are:
New Hampshire: Twelfth[:] Congress shall never disarm any Citizen unless such as are or have been in Actual Rebellion.
Virginia: … Seventeenth, That the people have a right to keep and bear arms; that a well regulated Militia composed of the body of the people trained to arms is the proper, natural and safe defence of a free State. That standing armies in time of peace are dangerous to liberty, and therefore ought to be avoided, as far as the circumstances and protection of the Community will admit; and that in all cases the military should be under strict subordination to and governed by the Civil power.
New York: ... That the People have a right to keep and bear Arms; that a well regulated Militia, including the body of the People capable of bearing Arms, is the proper, natural and safe defence of a free State; That the Militia should not be subject to Martial Law except in time of War, Rebellion or Insurrection. That Standing Armies in time of Peace are dangerous to Liberty, and ought not to be kept up, except in Cases of necessity; and that at all times, the Military should be under strict Subordination to the civil Power.
North Carolina: Almost identical to Virginia demand, but with "the body of the people, trained to arms" instead of "the body of the people trained to arms."
Rhode Island: Almost identical to Virginia demand, but with "the body of the people capable of bearing arms" instead of "the body of the people trained to arms," and with a "militia shall not be subject to martial law" proviso as in New York.