Up to this point in the battle the English and Welsh longbowmen (archers) had not been used to their full advantage. They were moved to the right side of the English lines. From here they could fire arrows into the Scottish army with great effect. But Robert the Bruce had provided for this event. His 500 light horsemen led by Keith, the Marischal, quickly scattered the English and Welsh archers. many of the English and Welsh archers ran back to the English lines. This caused more confusion and the infantry also begin to run away. The Scottish king now sent in his reserve division behind Douglas. When the English saw another large force of Scots joining the battle they began . Everywhere King Edward looked his forces were losing the battle.