Flag of truce.
--A flag-of truce boat from Fortress Monroe, under charge of Lieutenant Mulford, arrived at Varina yesterday morning, having on board several hundred returned sick and wounded Confederate prisoners. Soon after the information of her arrival was received, Colonel Ould and Captain W. H. Hatch, of the Exchange Bureau, proceeded to Varina to make the necessary arrangements for the delivery of our prisoners here.A number of Yankees will be sent North by the returning steamer.