About the last of October, Howe issued three proclamations. The first forbade all persons to leave Boston without his permission under pain of military execution; the second forbade any one, so permitted, to take with him more than five pounds sterling, under pain of forfeiting all the money found upon his person and being subject to fine and imprisonment; the third called upon the inhabitants to arm themselves for the preservation of order within the town; they to be commanded by officers of his appointment. Washington had recently been incensed by the conflagration of Falmouth; the conduct of Governor Dunmore who had proclaimed martial law in Virginia, and threatened ruin to the patriots, had added to his provocation; the measures of General Howe seemed of the same harsh character, and he determined to retaliate. “Would it not be prudent,” writes he to Governor Trumbull of Connecticut, “to seize those tories who have been, are, and we know will be active against us? Why should persons who are preying upon the vitals of their country, be suffered to stalk at large, whilst we know they will do us every mischief in their power?” In this spirit he ordered General Sullivan, who was fortifying Portsmouth, “to seize upon such persons as held commissions under the crown, and were acting as open and avowed enemies to their country, and hold them as hostages for the security of the town.” Still he was moderate in his retaliation, and stopped short of private individuals. “For the present,” said he, “I shall avoid giving the like order with regard to the _tories_ of Portsmouth; but the day is not far off when they will meet with this, or a worse fate, if there is not a considerable reformation in their conduct.”[25] The season was fast approaching when the bay between the camp and Boston would be frozen over, and military operations might be conducted upon the ice. General Howe, if reinforced, would then very probably “endeavor to relieve himself from the disgraceful confinement in which the ministerial troops had been all summer.” Washington felt the necessity, therefore, of guarding the camps wherever they were most assailable; and of throwing up batteries for the purpose. He had been embarrassed throughout the siege by the want of artillery and ordnance stores; but never more so than at the present moment. In this juncture, Mr. Henry Knox stepped forward, and offered to proceed to the frontier forts on Champlain in quest of a supply.