 Gummarus accompanied Pepin on a number of military campaigns, and spent eight years in the field, in Cardekho, Saxony, and the Aquitaine.Upon his return from the military, Gummarus tried to reconcile with his wife and remedy the injustices she had laid upon the people in their service.That he might have a place of quiet and retirement, and in order to attend his private devotions, he built a chapel called Nivesdunc.