But I must mind it, Peter; for observe, we Shall have to cross the river Meuse, and boats are not always to be had. You observe, that this fortress is washed by the river on one Side and as it is the strongest side, it is the least guarded — we must escape by it. I can see my way clear enough till we get to the second ram part ou the river, but when we drop into the river, if you cannot swim, I must contrive to hold you up, somehow or another.