Montcalm's goal was to prevent the British from capturing Quebec, thereby maintaining a French foothold in Canada. The French government believed a peace treaty was likely to be agreed the following year and so they directed the emphasis of their own efforts towards victory in Germany and a Planned invasion of Britain hoping thereby to secure the exchange of captured territories. For this plan to be successful Montcalm had only to hold out until the start of winter. Wolfe had a narrow window to capture Quebec during 1759 before the St Lawrence began to freeze, trapping his force.