In 1294, Guy, Count of Flanders turned for help to King Edward I of England, arranging a marriage between his daughter Philippa and
Edward, Prince of Wales. However, King Philip IV of France imprisoned Guy and two of his sons, forcing Guy to call off the marriage, and imprisoned Philippa in Paris. Philippa remained imprisoned until her death in 1306. The Count of Flanders was summoned before King Phillip again in 1296, and the principal cities of Flanders were taken under royal protection, until Guy paid an indemnity and surrendered his territories, to hold them at the grace of the King. After these indignities, Guy attempted to seek revenge on Philip by an alliance with King Edward I of England in 1297, which was at war with France. Philip responded by declaring Flanders annexed to the royal domain and sent a French army under
Robert II of Artois to conquer Flanders. Guy's eldest son
Robert of Bethune occupied
Mortagne, at the confluence of the
Scheldt and the
Scarpe rivers, and the
castle of Helkijn. In March 1297, King Philip arrested all partisans of the Count of Flanders and seized all their property. Philip then occupied the
castle of L'Ecluse near Douai. In June 1297 Philip gathered an army of about 3,000 knights at
Compiègne. The French army marched on
Arras (6 June),
Lens (12 June) and reached the Franco-Flemish border near Douai on 14 June 1297. The next day part of the French cavalry, led by the King's brother
Charles of Valois and by Raoul de Nesle crossed the border near Râches and encountered part of the Flemish army, consisting of German mercenaries, which was defeated. After this setback Orchies surrendered to France. Valois' troops, raided and burned the countryside up to Lille, but then returned to the French main army. ==Opposition==