...Lexington, Savannah, (Tenn.,) March 1, 1862. sir: In company with the gunboat Tyler, Lieut. Commanding Gwinn, I this day proceeded in this vessel up the river to a landing on the west side called Pittsburgh , distant about nine miles from this place. When we had arrived within twelve or thirteen hundred yards of Pittsburgh we were fired upon by a rebel battery, consisting, as well as I could judge, o...