To husband those resources became, under these circumstances, his imperious duty. The posture of affairs in Lower Canada, as he had stated to General Brock, in his letter of the 17th September, particularly on the frontier of Montreal, required every soldier in that Province, and no further reinforcements could be sent by him to the other. Not aware of any advantage which could arise from offensive operations against America, to compensate for the loss they might occasion, and for the consequent insecurity to the Provinces which he was defending, Sir George Prevost continued to urge upon General Brock, and after his death, upon his successor, General Sheaffe, the necessity of adhering to a defensive system; nor does it appear from any part of the correspondence between these officers and Sir George Prevost, that they had any particular object in view, which that policy restrained them from pursuing. Previous to the armistice, and to the capture of Hull's army at Detroit, General Brock had in his letters of 3d and 26th July, 1812, before referred to, given his reasons, which were evidently independent of the consideration of any instructions from Sir George Prevost, why he did not meditate offensive operations against the American frontier; and subsequent to the capture of Detroit, and after his arrival at Fort George in September, it has been clearly shewn, that his situation and means precluded him from such measures, except at a great risk, and for the accomplishment of inadequate objects.