Among the early reports, inducing the project of invading Canada, were the letters of Maj. John Brown (Aug. 14, 1775) and Ethan Allen (Sept. 14th) respecting the condition of the Canadians (Sparks's _Corresp. of the Rev._, i. 461, 464). There are other letters on the state of Canada at this time in the _N. H. Prov. Papers_, vii. 515, 547, 561-62, 569. The Schuyler Papers, with the letters which they contain of Montgomery, Arnold, Wooster, and Sullivan, are a main source of information respecting the whole campaign.[632] [Illustration: FROM THE ATLAS OF WILKINSON'S MEMOIRS. A modern eclectic map is given in Carrington's _Battles_, 171. The most considerable contemporary map for the illustration of the movements during the Revolution in Canada is one published by Jefferys, in 1776, of the _Province of Quebec, from the French Surveys and those made by Capt. Carver and others after the War, with much detail of names, plan of Quebec and heights of Abraham, Montreal and isles of Montreal_ (27 x 19 inches). On Feb. 16, 1776, Sayer and Bennett published in London _A new map of the Province of Quebec according to the royal proclamation of 7 Oct., 1763, from the French surveys, corrected with those made after the war by Captain Carver and other officers in his majesty's service_. There was a French reproduction of it in Paris in 1777, included in the _Atlas Ameriquain_ (1778), called _Nouvelle Carte de la Province de Quebec selon l'édit du Roi d'Angleterre du 7 8{bre}, 1763, par le Capitaine Carver, traduites de l'Anglois, à Paris chez le Rouge, 1777_. Jefferys also issued in 1775 _An exact Chart of the River St. Lawrence from Fort Frontenac to Anticosti_ (37 X 24 inches), which is usually accompanied by a _Chart of the Golf of St. Lawrence, 1775_(24 X 20 inches). _North Amer. Pilot_, nos. 11, 20, 21, 22. There is in the _Geschichte der Kriege in und ausser Europa_ [Nuremberg], 1776, a "Karte von der Insel Montreal und den Gegenden umher", following a plan by Bellin. A map of Canada in 1774 is embraced in Mitchell's _Map of the British Colonies_, and in Wright's ed. of _Cavendish's Debates in the Commons (1774) on the Canada bill_, London, 1839. There are other maps in the _American Atlas_ and Hilliard d'Auberteuil's _Essais_.] Schuyler's health preventing his taking the field in person, the interest in the campaign centres in Montgomery up to the time of his death.[633] We have despatches of his (Nov. 3, 1775) on the capture of St. Johns,[634] on the taking of Chamblée,[635] and on the capitulation of Montreal,[636] with his letters from before Quebec (Sparks, _Corresp._, i. 492, etc.). A letter from one of his aids at this time (Dec. 16, 1775) is in _Life of George Read_, p. 115. The principal Life of Montgomery is that by J. Armstrong, in Sparks's _Amer. Biography_ (i. p. 181), which may be supplemented by other minor accounts.[637]