Jackson's movement was observed by the Union army about 9 a.m. but Pope thought Jackson was marching to the Shenandoah Valley. Consequently, he turned his attention to Longstreet's wing, which was demonstrating along the Rappahannock River during the day. Pope's orders throughout the day were contradictory and the Union army was unable to mount an attack across the river as Pope intended. When Union cavalry spotted Jackson coming through Thoroughfare Gap, Pope pulled his forces back from the river and attempted to locate Jackson's force.