...st, but the ridge shown in the picture was the scene of a most gallant resistance to the Confederate advance by the 9th Massachusetts regiment, acting as a rear-guard to Porter's corps. The road to New Cold Harbor and the battle-ground runs to the right. The mill-stream runs into Powhite Swamp, and thence into the Chickahominy. to be kept, under all circumstances, in the valley of the Chickahominy, had been...