Lee had sent Longstreet to reinforce Jackson…
August 1862 CE
Lee arrives at Gordonsville to take command on August 15.
He masses the Army of Northern Virginia south of Clark's Mountain and plans a turning movement to defeat Pope before McClellan's army can arrive to reinforce it.
His plan is to send his cavalry under J.E.B. Stuart, followed by his entire army, north to the Rapidan River on August 18, screened from view by Clark's Mountain.
Stuart is to cross and destroy the railroad bridge at Somerville Ford, then move around Pope's left flank into the Federal rear, destroying supplies and blocking their possible avenues of retreat.
Logistical difficulties and cavalry movement delays will cause he plan to be abandoned.