four o'clock
He then directed the prisoners to be released from their handcuffs and locked them in the room , stationing one of the soldiers at the door and sending the other to patrol the back of the house from which the two windows of the room looked out . At the end of two hours the sentries were to change places , and in two hours more they were to be relieved by a detachment from the night patrol . This arrangement had been foreseen by Soudeikin , and it had been settled that the rescue was to be attempted as soon as the guard had been changed . This would give the prisoners time to get a brief but much needed rest after their long and miserable journey from Perm , penned up like sheep in iron-barred cattle trucks , and it would leave the drowsiest part of the night , from four o'clock to sunrise , for the hazardous work in hand . `` That is a pretty girl you have there , captain , '' said Colston , as the officer returned to the sitting-room . `` Is she for the mines or Sakhalin ? '' `` For Sakhalin by sentence , but as a matter of fact for neither , as far as I can see . ''