The Further Adventures of Robinson Crusoe by Daniel Defoe Chapter 16 Page 9

bolts; on the north side, an unnavigable ocean, where ship never sailed, and boat never swam; every other way we have above a thousand miles to pass through the Czar’s own dominion, and by ways utterly impassable, except by the roads made by the government, and through the towns garrisoned by his troops; in short, we could neither pass undiscovered by the road, nor subsist any other way, so that it is in vain to attempt it.”

I was silenced at once, and found that they were in a prison every jot as secure as if they had been locked up in the castle at Moscow: however, it came into my thoughts that I might certainly be made an instrument to procure the escape of this excellent person; and that, whatever hazard I ran, I would certainly try if I could carry him off.