which groups fought in this?
French army and  Anglo-Gascon army (English Army)
Siege of Aiguillon
 when a French army commanded by John, Duke of Normandy, laid siege to the Gascon town of Aiguillon. The town was defended by an Anglo-Gascon army under Ralph, Earl of Stafford.

what is siege of aiguillon? It was an episode in the Hundred Years' War, began on 1 April 1346 when a French army commanded by John, Duke of Normandy, laid siege to the Gascon town of Aiguillon.
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Siege of Aiguillon [SEP] Introduction
Duke John, considering it a matter of honour, refused. By August, the French supply system had broken down, there was a dysentery epidemic in their camp, desertion was rife and Philip VI's orders were becoming imperious. On 20 August the French abandoned the siege and their camp and marched away. Six days later the main French army was decisively beaten in the Battle of Crécy with very heavy losses. Two weeks after this defeat, Duke John's army joined the French survivors.