No sooner had the United States army arrived in the vicinity of Montreal than it became increasingly clear it was, for all practical purposes, impossible to besiege. Too many outlets were available for supplies to continue to reach the garrison. Worse still, reports were arriving (D4) that the Empire garrison in Quebec might be on the move, using the extensive 1885 rail network. This left only two options. ONE. To establish a permanent American headquarters at Longueuil. TWO. To launch a full scale assault on the city of Montreal. The advantage to the second option being, they could always revert to option ONE, and there was plenty of time to secure Longueuil for the winter. Having sent American brigades to key locations, counter-orders were now dispatched calling in most of these lesser positions. Empire commanders in Montreal looked on in some disarray, thinking (D1) all this had been carefully and correctly enacted by the Americans. This led to the Empire forces keeping some of their troops in unnecessary locations, fearful of an attack from some unexpected quarter.