 Complete the following phrase:  Despite the significant head start of the southern forces, cavalry forces from each side met, and began skirmishing on May 4. Union General George Stonemans cavalry encountered and began skirmishing with Brig. Gen. J.E.B. Stuarts cavalry, the Confederates rearguard. Learning of this, and frustrated by the slow progress of his own forces which were passing through Williamsburg, Confederate General Joseph E. Johnston detached a portion of his troops to confront the advancing Union troops. On May 5, 1862, the single-day 