 From this time on Helias was a loyal supporter of Duke Robert and later to his son William Clito.In 1094, William Rufus had crossed over from England and after failing at diplomacy he raised an army of mercenaries at Eu and attacked south into Normandy; his first victory was in capturing Helias'castle of Bures-en-Bray, at the time garrisoned by Duke Robert's men.During the period from 1104 to 1106 Helias supported Robert Curthose, but in 1106 after the Battle of Tinchebray (in which Robert Curthose was captured and imprisoned by Henry) Helias seems to have been curiously on good terms with Henry I.