midnight
`` No doubt we shall all be talked to , and perhaps kept in the guardroom a few days , but that wo n't hurt us ; and soldiers are scarce enough , so they will hardly keep ten or twelve men long from duty . There are not enough in the town , now , to furnish all the guards properly ; so you need not worry about us . `` I will give you instructions how to find my sister 's house , tomorrow night . You must not escape until you hear the bell strike midnight . Our party will relieve guard at that hour . You see , we have four hours on duty and , as you may have gone either on the first watch , the second , or the third , they will not be able to pitch on us more than on the others ; so that , in fact , the blame will be divided between forty of us . You will , of course , put on your disguises over your uniforms , and destroy your clothes , when you get to Jules ' house . ''