In 1340, Odo first fought in Hainaut, helped capture the town of Antoing and later defended Saint-Omer in the battle there against Robert III of Artois.
Pada tahun 1340, Eudes pertama-tama berjuang di Hainaut, membantu menangkap kota Antoing dan kemudian membela Saint-Omer di dalam pertempuran di sana terhadap Robert III dari Artois.