Meanwhile, Edward III left Flanders in August 1339, where he had been on the continent since July 1338. Edward had asserted his rights to the throne of France, openly defying the authority of Philip VI. Wanting to satisfy his Bavarian allies, he decided to seize Cambrai. Edward asked the bishop of Cambrai, Guillaume d'Auxonne, a vassal of the Holy Roman Empire, to let him in, however the bishop also had instructions from Philip VI informing him to hold on for a few days until he arrived with a French army. Guillaume proclaimed his allegiance to France and prepared to resist a siege.
The defence of Cambrai was provided by the governor Étienne de la Baume, grand master of the crossbowmen of France. The French garrison had artillery comprising 10 guns, five of iron and five of other metals. This is one of the earliest references to the use of cannon in siege warfare.[2]
Edward launched several attacks from 26 September, with Cambrai resisting every assault for five weeks.[3]
When Edward learned on the 6 October that Philip was approaching with a large army, he abandoned the siege on 8 October.[1] He retreated across Picardy, devastating the plains of Cambresis along the way. A strong English garrison was left in the castle of Thun-l'Eveque. Edward then proceeded to Saint-Quentin. On 23 October, the armies of England and France faced each other across the plain between La Capelle and Buironfosse. They separated without engaging in battle.
J. Aicard, F. Bourquelot, A. Bravais, F. Chassériaux, A. Deloye, D. Denne-Baron, Desportes, P. Gervais, Jung, Léon Lalanne, Ludovic Lalanne, Le Chatelier, A. Le Pileur, Ch. Louandre, Ch. Martins, V. Raulin, F. Régnier, L. Vaudoyer et Ch. Vergé, Patria : La France ancienne et moderne morale et matérielle ou Collection encyclopédique et statistique de tous les faits relatifs à l'histoire physique et intellectuelle de la France et de ses colonies, Paris, 1847, p. 1244
N. Chareyron, Jean le Bel maître de Froissart grand imagier de la Guerre de Cent Ans, Ed. De Boeck Université, Bruxelles, 1996, p. 220
L. Figuier, Exposition et histoire des principales découvertes scientifiques, t. 3, 1858, p. 336
A. Ch. N. de Lateyssonnière, Recherches historiques sur le département de l'Ain, t. 3, Bourg, 1841, pp. 284–293
A. Guilbert, Histoire des villes de France, Paris, 1845, p. 274
Pères Richard et Giraud, Bibliothèque Sacrée et Dictionnaire Universel, t. 20, Paris, 1827, p. 206
C. Robert, Numismatique de Cambrai, Paris, 1861, p. 100