This event is particularly unfortunate, and may reduce us to incalculable distress. The enemy is making every exertion to gain a naval superiority on both lakes, which if they accomplish I do not see how we can retain the country. More vessels are fitting out for war on the other side of Squaw Island, which I should have attempted to destroy but for your excellency's repeated instructions to forbear. Now such a force is collected for their protection as will render every operation against them very hazardous. The manner our guns were served yesterday, points out the necessity of an increase, if possible, of artillerymen to our present small number of regulars. The militia evinced a good spirit, but fired without much effect. The enemy, however, must have lost some men; and it is only wonderful, that in a contest of a whole day no life was lost on our side. The fire of the enemy was incessant, but badly directed, till the close of the day, when it began to improve. Lieutenant Rolette, who commanded the Detroit, had, and I believe deservedly, the character of a brave, attentive officer. His vessel must, however, have been surprised--an easy operation where she lay at anchor; and I have reason to suspect that this consideration was not sufficiently attended to by the officers commanding on board and on shore. We have not only sustained a heavy loss in the vessel, but likewise in the cargo, which consisted of four 12-pounders, a large quantity of shot, and about 200 muskets, all of which were intended for Kingston and Prescott. The only consolation remaining is, that she escaped the enemy, whose conduct, after his first essay, did not entitle him to so rich a prize. The enemy has brought some boats over land from Schlosher to the Niagara river, and made an attempt last night to carry off the guard over the store at Queenston. I shall refrain as long as possible, under your excellency's positive injunctions, from every hostile act, although sensible that each day's delay gives him an advantage. _Sir Isaac Brock to Colonel Proctor, at Detroit_. The unfortunate disaster which has befallen the Detroit and Caledonia will reduce us to great distress. They were boarded whilst at anchor at Fort Erie and carried off: you will learn the particulars from others. A quantity of flour and a little pork were ready to be shipped for Amherstburg; but as I send you the flank companies of the Newfoundland, no part of the provisions can go this trip in the Lady Prevost. It will be necessary to direct her to return with all possible speed, bringing the Mary under her convoy. You will husband your pork, for I am sorry to say there is but little in the country.