Dearborn submitted a plan of campaign, recommending that the main army advance by way of Lake Champlain upon Montreal, while three corps of militia should enter Canada from Detroit, Niagara and Sackett's Harbour. This was as near as Dearborn ever came to a successful invasion of Canada. War was declared on June 18, 1812, and July had been frittered away before he left Albany. Meantime General Hull, whose success depended largely upon Dearborn's vigorous support from Niagara, having been a fortnight on British soil, now recrossed the river and a few days later surrendered his army and Detroit to General Brock. This tragic event aroused Dearborn sufficiently to send Stephen Van Rensselaer to command the Niagara frontier, the feeble General assuring the secretary of war that, as soon as the force at Lewiston aggregated six thousand men, a forward movement should be made; but Dearborn himself, with the largest force then under arms, took good care to remain on Lake Champlain, clinging to its shores like a barnacle, as if afraid of the fate visited upon the unfortunate Hull. Finally, after two months of waiting, Van Rensselaer sent a thousand men across the Niagara to Queenstown to be killed and captured within sight of four thousand troops who refused to go to the help of their comrades. Disgusted and defeated, Van Rensselaer turned over his command to Brigadier-General Alexander Smith, a boastful Irish friend of Madison from Virginia, who issued burlesque proclamations about an invasion of Canada, and then declined to risk an engagement, although he had three Americans to one Englishman. This closed the campaign of 1812.