...eans mark communication was kept open with the North and East. On Saturday the steamer left this city at her usual hour, six o'clock in the morning, but when she reached Havre-de-Grace, by order of Gen. Patterson , the L. was not permitted to return to Baltimore. --The passengers by the train reached this city in a furniture wagon. The mails by the same train reached the city at one o'clock yesterday by a sa...