This rampart, which could avail mainly to shield the batteries that commanded the shipping in the St. Lawrence, was easy of ascent from the inside, as it could not be expected that any one would attempt leaving the upper town by the almost perpendicular precipice of more than two hundred feet. Yet such was the wild intention that Dick had formed. The attempt, on the part of a fugitive, seemed the more preposterous for the fact that, should he accomplish the almost impossible feat of safely descending the cliff, he would but find himself in the lower town, which was defended at either end and closely guarded along its river edge,--unless, indeed, he should traverse the face of the cliff diagonally, so as to arrive at the base outside the southern barrier of the lower town. As all the world knows, the walls of Quebec encircled the upper town on its high promontory, while the lower town, lying against that promontory's foot, needed no other defence on one side than the promontory itself. It was neither practicable nor necessary that a wall should run down the promontory's side; hence a man, finding himself on the steep declivity between the upper and the lower town, had a way of exit open to him, provided he could traverse obliquely the face of the cliff and could avoid observation from above or below. This way of escape recommended itself to Dick because the city gates would by this time be watched for him, and because it would bring him directly to the place where Arnold's man would be waiting to receive the report that was to have been brought by Mere Frappeur in her boat. Dick knew the rampart overlooking the St. Lawrence would be the least guarded, as the British force was too small for the proper manning of the many and large defences. Slinking at a distance past the right flank of the grand battery, whose overworked sentries were shivering in the snow, he found a place where a platform enabled him to mount easily the rampart. Across this rampart he crawled, on hands and knees, making out through the falling flakes a single sentry who paced several rods away. Looking over the outer edge of the rampart, his head turned giddy, for a moment, at sight of the precipice falling sheer almost three hundred feet to the narrow fringe of houses and the gloomy river below.