...ters was kept up, varied with occasional discharges of artillery; the rebel shells and round shot fell at times thickly within the national lines, but the casualties were few. This day, Grant ordered Colonel Webster , of his staff, to make a reconnoissance, with a view to sending a force above the town of Dover, to occupy the river bank. At three o'clock on Friday, six gunboats, four of which were iron-clad, ...