...ock, under the command of Capt. Samuel McGraw, have lately made several expeditions, some of them with very important results. A few days since several of the gunboats steamed up to the town of Tappahannock , where there was a strong rebel cavalry picket, which was shelled out, and some of our men landed, and they destroyed about 20,000 bushels of grain which were stored there. A party was sent ashore ...