"We must undermine the gate, O'Brien; we must pull up the pavement until we can creep under." "Peter, you are a fine fellow; I never thought of that." We worked very hard until the hole was large enough, using the crow-bar which was left, and a little wrench which O'Brien had with him.

By these means we got under the gate in the course of an hour or more.

This gate led to the lower rampart, but we had a covered way to pass through before we arrived at it.

We proceeded very cautiously, when we heard a noise: we stopped, and found that it was a sentry, who was fast asleep, and snoring.

Little expecting to find one here, we were puzzled; pass him we could not well, as he was stationed on the very spot where we required to place our crow-bar to descend the lower rampart into the river.