In Gettysburg, Brig. Gen. John Buford and his cavalry division spot elements of Henry Heth's division of A. P. Hill's Third Corps approaching the town and recognizes that the Confederate army is approaching. Buford recognizes that, with precedent from previous battles, the Confederates will arrive at Gettysburg first and entrench in strong positions, forcing the Union to charge them and suffer heavy casualties. To prevent this, he opts to stand and fight where he is, judging the terrain to be "lovely ground" for slowing the Confederate advance. Buford sends word to I Corps commander Maj. Gen. John F. Reynolds to bring up reinforcements. Heth's troops engage Buford's cavalry the following morning, July 1, with Richard S. Ewell's Second Corps moving in to flank them. Reynolds brings his corps forward, but is killed by a Confederate sharpshooter. The Union army is pushed out of Gettysburg to Cemetery Ridge, and Lee—rejecting Longstreet's suggestion to redeploy south of Gettysburg and go on the defensive—orders Ewell to take the Union position "if practicable". However, Ewell hesitates and does not engage. The armies concentrate at their chosen positions for the remainder of the first day. At Confederate headquarters at Seminary Ridge, Maj. Gen. Isaac R. Trimble angrily denounces Ewell's inaction to Lee, and requests another assignment.