While at the hospital McDougall of California came up from the neighborhood of Gen. Schenck and said he was going back towards Centreville to a convenient place where he could get water and take lunch. As Grimes and myself had got separated from Messrs. Wade and Chandler and Brown, who had with them our supplies, we concluded to go back with McD. and partake with him. We returned on the road towards Centreville and turned up towards a house fifty or a hundred yards from the road, where we quietly took our lunch, the firing continuing about as before. Just as we were putting away the things we heard a great noise, and looking up towards the road saw it filled with wagons, horsemen and footmen in full run towards Centreville. We immediately mounted our horses and galloped to the road, by which time it was crowded, hundreds being in advance on the way to Centreville and two guns of the Sherman battery having already passed in full retreat. We kept on with the crowd, not knowing what else to do. On the way to Centreville many soldiers threw away their guns, knapsacks, etc. Gov. Grimes and I each picked up a gun. I soon came up to Senator Lane of Indiana, and the gun being heavy to carry and he better able to manage it, I gave it to him. Efforts were made to rally the men by civilians and others on their way to Centreville, but all to no purpose. Literally, three could have chased ten thousand. All this stampede was occasioned, as I understand, by a charge of not exceeding two hundred cavalry upon Schenck's column down in the woods, which, instead of repulsing as they could easily have done (having before become disordered and having lost some of their officers), broke and ran, communicating the panic to everybody they met. The rebel cavalry, or about one hundred of them, charged up past the hospital where we had been and took there some prisoners, as I am told, and released those we had. It was the most shameful rout you can conceive of. I suppose two thousand soldiers came rushing into Centreville in this disorganized condition. The cavalry which made the charge I did not see, but suppose they disappeared in double-quick time, not dreaming that they had put a whole division to flight. Several guns were left down in the woods, though I believe two were brought off. What became of Schenck I do not know. Tyler, I understand, was at Centreville when I got back there. Whether other portions of our army were shamefully routed just at the close of the day, after we had really won the battle, it seems impossible for me to learn, though I was told that McDowell was at Centreville when we were there and that his column had also been driven back. If this be so it is a terrible defeat. At