The character of the war--a war between a sovereign and those who professed to be his subjects, led to a course of conduct on the part of the British General, which the actual state of things did not justify.
General Gage, as Governor of Massachusetts, had received all the irritations of which his mind was susceptible--irritations which seemed to have had no inconsiderable influence over his conduct as Commander-in-chief.

He regarded the Americans nearly as rebels; and treated them as if the great national resistance they were making on principle, was to be viewed as the act of a few daring and turbulent individuals, rising against laws of unquestionable obligation, who would soon be quelled, and punished for their disobedience of legitimate authority.

In this spirit, he threw some distinguished gentlemen of Boston, and the American officers and soldiers who fell into his hands, into the common jail of felons; and treated them, without respect to military rank or condition, not as prisoners of war, but as state criminals.
[Sidenote: Correspondence respecting prisoners.] General Washington remonstrated very seriously against this unjustifiable measure.

Considering political opinion entirely out of the question, and "conceiving the obligations of humanity, and the claims of rank, to be universally binding, except in the case of retaliation;" he expressed the hope he had entertained, "that they would have induced, on the part of the British General, a conduct more conformable to the rights they gave." While he claimed the benefits of these rights, he declared his determination "to be regulated entirely, in his conduct towards the prisoners who should fall into his hands, by the treatment which those in the power of the British General should receive." To this letter, a haughty and intemperate answer was returned, retorting the complaints concerning the treatment of prisoners, and affecting to consider it as an instance of clemency, that the cord was not applied to those whose imprisonment was complained of.

To this answer, General Washington gave a manly and dignified reply, which was, he said, "to close their correspondence perhaps forever;" and which concluded with saying, "If your officers, our prisoners, receive from me a treatment different from what I wished to show them, they and you will remember the occasion of it." The result of this correspondence was communicated to the council of Massachusetts,[18] who were requested to order the British officers then on parole to be confined in close jail, and the soldiers to be sent to such place of security as the general court should direct.
[Footnote 18: In the early part of the war, congress had appointed no commissary of prisoners; nor had the government taken upon itself the custody of them.