After returning from Italy, Charles held an assembly at Worms with the purpose of dealing with the Vikings. Armies from the whole East Francia were assembled in the summer under Arnulf, Duke of Carinthia, and Henry, Count of Saxony. The chief Viking camp was then besieged at Asselt. Charles then opened negotiations with the Viking chiefs Godfrid and Sigfred. Godfrid accepted Christianity and became Charles's vassal. He was married to Gisela, daughter of Lothair II of Lotharingia. Sigfred was bribed off. Despite the insinuations of some modern historians, no contemporary account criticised Charles's actions during this campaign. In 885, fearing Godfrid and his brother-in-law, Hugh, Duke of Alsace, Charles arranged for a conference at Spijk near Lobith, where the Viking leader fell into his trap. Godfrid was executed, and Hugh was blinded and sent to Prüm.