From the West - The British fleet, including the new ship, the St. Lawrence, arrived the 19th ult. and anchored off Fort Niagara, where, it is understood, it received the greater part of Gen. Drummond's army and sailed down the Lake, supposed for Kingston, at which place it appeared evident, from information, preparations were making for a formidable attack on Sacket's Harbor. In consequence of this movement, Maj. Gen. Brown's Division was ordered immediately to take up its line of march for the Harbor, whither the General repaired without delay; and the remains of the army, under Maj. Gen. Izard, (the Volunteers and Militia being discharged) were ordered into winter-quarters at Black Rock, leaving a garrison at Fort Erie.
On Sunday Brig. Gens. Winder and Miller passed through this village for the eastward - the former for Sacket's Harbor, - and yesterday the remains of the 1st, or General Scott's veteran Brigade, consisting of about 800 troops, under Col. Brady, passed this on their way to the Harbor. The remainder of Gen. Brown's army is expected here today, or tomorrow.
Com. Chauncey's fleet is said to be moored across Sacket's Harbor, in such manner as to oppose a powerful resistance to an attack. The guns on one side of the vessels are taken out and placed in batteries on land, and the most active preparations were mking for the defense of that important military post.