...acked water slowly down the river. Whilst all this manoeuvring was going on, the firing had entirely ceased from all points. 3.40 o'clock.--The Merrimac now turns around and steams back towards Norfolk , with the rebel flag flying from her stern. The Baltimore steamer Georgiana has lain out in the stream with steam up all the afternoon, ready to escape from danger at the earliest practicable momen...