...osition which he took up in rear of it. Sedgwick, now opposed by Wilcox with a single brigade, advanced very cautiously up the plank road towards Chancellorsville. At Salem Church, half way between Fredericksburg and Chancellorsville, Wilcox held him in check until McLaws arrived with four brigades, about the middle of the afternoon. These troops had aided in defeating Hooker in the morning, and now put a s...