Sumner had accompanied the morning attack of Sedgwick's division, but another of his divisions, under French, lost contact with Sumner and Sedgwick and inexplicably headed south.
Sumner havde fulgt morgenens angreb med Segdwicks division men en anden af hans divisioner under French havde mistet kontakten med Sumner og Sedgwick og fortsatte af uforklarlige årsager sydpå.