The battle occurred after the victorious siege of the city of Quimper by Charles of Blois in 1344.

Thomas Dagworth, was en route to Ploërmel through Oust à Cadoret.

Opposite, Charles of Blois and his army arrived by the Landes de Cadoret.

Caught under a rain of arrows from Welsh archers, the army of Charles suffered many losses.

The French captains Galois de la Heuse and Péan of Fontenay were made prisoners and Charles abandoned the field.