From Gordonsville.
Gordonsville. Oct. 12.
--The Yankees appear to have known nothing of Gen. Lee's movements until Friday last, when they commenced falling back from Culpeper.
They finally retreated yesterday in such haste as prevented them from burning Rappahannock bridge.
Their force from all accounts was small.
It is reported that our troops burned Bull Run bridge in time to capture three of their trains.
Nine prisoners, captured by Mosby at Anandale, were brought here to-day.