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Knight and combatant par excellence, in 1325, at the age of sixteen, he won the Battle of Varey, near Pont d'Ain, in a brilliant battle against the Savoyards. Contemporary chronicles say that "l'ost de Savoye fut bellement desconfit." From that date to his death, Guigues was in constant conflict with his Savoyard neighbours.
French influence was reinforced during his reign, especially by his marriage to Isabelle, daughter of Philip V of France. In 1328, at the Battle of Cassel, Philip VI entrusted to Guigues the command of the Seventh Corps, with its twelve banners. In the battle the Flemish burgers were smashed by the French chivalry. For his courage, Guigues was rewarded with the Maison aux Piliers in Grève, Paris.
- Cox, Eugene L. (1967). The Green Count of Savoy. Princeton, New Jersey: Princeton University Press. LCCN 67-11030.