He sent staff officer after staff officer in search of Warren, directing that general to report to him, but they were unable to find him.

At all events Sheridan was unable to get that officer to him.

Finally he went himself.

He issued an order relieving Warren and assigning Griffin to the command of the 5th corps.

The troops were then brought up and the assault successfully made.
I was so much dissatisfied with Warren's dilatory movements in the battle of White Oak Road and in his failure to reach Sheridan in time, that I was very much afraid that at the last moment he would fail Sheridan.