 After crossing the river , Robb divides his forces , sending the aforementioned 2 @,@ 000 men to distract Lord Tywin 's army . Due to the false information Robb gave to the captured Lannister scout , Lord Tywin 's force believes it is the whole Stark army . The remainder of Robb 's men sneak up on Jaime Lannister 's ( Nikolaj Coster @-@ Waldau ) army , defeating them and capturing Jaime . When captured , Jaime challenges Robb to a one @-@ on @-@ one duel to settle the matter , which Robb declines . 
