At the Battle of Dupplin Moor, Balliol's army, commanded by Henry Beaumont, defeated the larger Scottish force. Beaumont made use of the same tactics that the English would make famous during the Hundred Years' War, with dismounted knights in the centre and archers on the flanks. Caught in the murderous rain of arrows, most of the Scots did not reach the enemy's line. When the slaughter was finally over, the Earl of Mar, Sir Robert Bruce (an illegitimate son of Robert the Bruce), many nobles and around 2,000 Scots had been slain. Edward Balliol then had himself crowned King of Scots, first at Perth, and then again in September at Scone Abbey. Balliol's success surprised Edward III, and fearing that Balliol's invasion would eventually fail leading to a Scots invasion of England, he moved north with his army.