The capture of General Lee became the occasion of embittering the complaints on this subject, and of aggravating the sufferings of the prisoners of war. Before that event something like a cartel for the exchange of prisoners had been established between Generals Howe and Washington, but the captivity of General Lee interrupted that arrangement. The general, as we have seen, had been an officer in the British army, but having been disgusted had resigned his commission, and, at the beginning of the troubles, had offered his services to Congress, which were readily accepted. General Howe affected to consider him as a deserter, and ordered him into close confinement. Washington had no prisoner of equal rank, but offered six Hessian field officers in exchange for him, and required that, if that offer should not be accepted, General Lee should be treated according to his rank in the American army. General Howe replied that General Lee was a deserter from his majesty's service, and could not be considered as a prisoner of war nor come within the conditions of the cartel. A fruitless discussion ensued between the Commanders-in-Chief. Congress took up the matter and resolved that General Washington be directed to inform General Howe, that should the proffered exchange of six Hessian field officers for General Lee not be accepted, and his former treatment continued, the principle of retaliation shall occasion five of the Hessian field officers, together with Lieut. Col. Archibald Campbell, or any other officers that are or shall be in possession of equivalent in number or quality, to be detained, in order that the treatment which General Lee shall receive may be exactly inflicted upon their persons. Congress also ordered a copy of their resolution to be transmitted to the Council of Massachusetts Bay, and that they be desired to detain Lieutenant-Colonel Campbell, and keep him in close custody till the further orders of Congress, and that a copy be also sent to the committee of Congress, in Philadelphia, and that they be desired to have the prisoners, officers, and privates lately taken properly secured in some safe place.