 According to the chronicles of Pegau Abbey, on 10 February 1115 the Imperial forces gathered at the "Kaiserpfalz" of Wallhausen and moved about towards Welfesholz (today part of Gerbstedt in Saxony-Anhalt) to meet the united Saxon troops led by Duke Lothair, with first skirmish occurring already on the same evening.The next day Henry's commander Hoyer of Mansfeld started an offensive whereby he was killed in a sword combat by the young robber knight Wiprecht II, son of the arrested Count Wiprecht of Groitzsch.The incident decided the battle