Four days later, on about 8 January, the armies met again in the Battle of Ashdown. The location of the battle is unknown, but may be Kingstanding Hill, north-west of Reading. According to Asser's account, the Vikings arrived first at the battle ground and deployed along the top of the ridge, giving them the advantage. They divided their forces into two contingents, one under their two kings and the other under their earls. When the West Saxons saw this, they decided to copy the formation, with Æthelred facing the kings and Alfred the earls. The king then retired to his tent to hear Mass, while Alfred led his forces to the battlefield. Both sides formed their forces into shield walls. Æthelred would not cut short his devotions and Alfred risked being outflanked and overwhelmed by the whole Danish army. He decided to attack and led his men in a charge. Battle then raged around a small thorn tree and finally the West Saxons were victorious. Although Asser emphasises Alfred's role in the victory and implies that Æthelred was dilatory, in the view of the military historian John Peddie, Æthelred was militarily correct to delay joining the battle until the situation was in his favour. The Vikings suffered heavy losses, including King Bagsecg and five earls, Sidroc the Old, Sidroc the Younger, Osbern, Fræna and Harold. The West Saxons followed the Viking flight until nightfall, cutting them down. The historian Barbara Yorke, who sees Asser's biography as intended to portray Alfred as an ideal king, comments that "Asser is particularly careful to give much credit to Alfred".