Yes, that is the Sunken Road, which would be re-named Bloody Lane. But what you can see in the background doesn't look to me like but what was left of the Cornfield.
That is the grove of trees the Federals used for cover, to form up before the attack. They were shot to firewood by Confederate artillery from the Dunker Church and the West Wood. (It looks very much like the trees after the F5 tornado in Midwest City, Oklahoma, back in the '90's, in fact.)
I WAS wrong about it being Mansfield's Corps. It was Sumner, the "Bull of the Woods," who led the attack on the Sunken Road.