June 28, 1863.

Sunday. Am all right again. To-day has been a busy one. A big gun, the biggest I ever saw, "Old Abe" it is called, was dragged here last night and got up on the point opposite the Rebels' water battery. To-day the gun has been got into position. Being so near, and having so little to do, I put in the day with them, helping in any way I could. The fort is made of cotton bales, backed up by bags of earth too thick to be shot through. When all was ready it was most sundown. A limb with thick leaves hung over one side, and under this I got to see what happened. When "Old Abe" finally did speak, the shell went into the ground way under the rebel gun, and after what seemed a long time exploded. The whole thing went up in the air, and when the dust settled, the muzzle of the gun lay sticking over the bank, pointed up toward the moon. So ended the famous "water battery" that we have heard so much about. "Billy Wilson's" Zouave regiment, our left-hand neighbor, then came up the ravine dragging a long rope they had got from the gunboats, and slipped it over the muzzle of the gun, intending to drag it over. But they couldn't budge it, and finally gave it up. Next they came back with hand grenades which they fired and tossed over. They had cut the fuses too long and they had no more than landed on the other side when the Rebs threw them back. That made the red legs skedaddle, and all that saved them was the fact that in coming up they had come on a slant, while the grenades rolled directly down. As it was, a piece hit a drummer boy, and he lies here on the ground apparently breathing his last. The top of his head has a large piece chipped off. There has been a good deal of powder burned to-day. What has been done besides tearing up the water battery I don't know. To-night the mortar boats have been throwing shells into the works. They pass directly over us. We are so near, the report is almost stunning. The fuse is cut long enough to last until they drop. I hope none of them may go off while over our quarters.