CHAPTER LII.
BATTLE OF SPOTTSYLVANIA--HANCOCK'S POSITION--ASSAULT OF WARREN'S AND WRIGHT'S CORPS--UPTON PROMOTED ON THE FIELD--GOOD NEWS FROM BUTLER AND SHERIDAN.
The Mattapony River is formed by the junction of the Mat, the Ta, the Po and the Ny rivers, the last being the northernmost of the four.

It takes its rise about a mile south and a little east of the Wilderness Tavern.

The Po rises south-west of the place, but farther away.
Spottsylvania is on the ridge dividing these two streams, and where they are but a few miles apart.

The Brock Road reaches Spottsylvania without crossing either of these streams.

Lee's army coming up by the Catharpin Road, had to cross the Po at Wooden Bridge.