In 1007, Bolesław, possibly preempting an attack by Henry, once again marched against the Luitici tribes. His campaign took him up to the gates of Magdeburg and he regained control of eastern Lusatia and Meissen. After several unsuccessful campaigns by the German king from 1010 onwards, another peace was agreed to in Merseburg in 1013. This time Bolesław kept eastern Lusatia and the Milceni lands around Bautzen as Imperial fiefs. He also received military aid from Henry for his intervention in the Kievan succession crisis. In return, Bolesław swore an oath of allegiance, promised to support Henry's bid for the crown of Holy Roman Emperor and aid him in his Italian campaigns. To confirm the alliance, Bolesław's son Mieszko II Lambert married the German noblewoman Richeza of Lotharingia, a distant relative of King Henry.