BLACK ROCK, June 28, 1812.
THERE is every reason to believe that the British meditate an attack on Fort Niagara, and that it may be attempted within twenty-four hours from this time. If they once pass the river it is impossible to say how far they may proceed. Under these very urgent circumstances, I despatch an express to request that you will immediately march the men under your command to our assistance. Although you may not have received orders authorizing you to comply with this request, I am persuaded the occasion will justify you, as your men can be of no possible use at Canandaigua, or any other place along the south shore of the lake, and are undoubtedly intended, ultimately, for this place. Bring with you all the arms and ammunition in the Canandaigua arsenal.
In great haste, yours respectfully,
PETER B. PORTER, Q. M. G.
[Major General Hall addressed Major Mullany by the same conveyance, and equally urgent, with an assurance that the people would bear him harmless in the event of his being censured by the government for marching for their protection, &c. &c]