XXI.

It is often asked why the prisoners did not revolt, and with the mighty energy of despair wrench down the gates, and strangle with their hands the few thousand of rebel guards. To burst through the massive timbers of the gates and the outer lines of palisades, and then force the encircling row of ramparts, which were bristling with troops and cannon, required something more than courage. This gigantic strength, this desperation of vigor, was not possible for the prisoners; for the food, and the external impressions--whether of the heat, cold, or horror--had too much impoverished the blood,--the blood, which imparts force to human volition.