The post-war boom or 'trentes glorieuses' saw industrial development on the outskirts of the town, including the chemical company (Cofradec) and food (Laiterie des 4 Cantons) inaugurated by Charles de Gaulle in 1959.

Furthermore, the historian Jules Duvivier would rather name an ancient Count of Hainaut: indeed, in the 8th century, portions of territories around the present town belonged to the Leudes, fellows of the Frankish kings to whom they were granted.

He also brought horses from Italy and Spain, sheep from Catalonia, which yielded fine highly regarded wool, imbuing the drapers of Le Quesnoy with great renown: they mixed them with silk to make fabrics called Sayette.

She divorced, for reasons unknown (Bouchard belonged, however, to English stock) and married again in 1223, a knight of Champagne, Guillaume de Dampierre who gave her three sons, and she tried to help (them) by bequest and inheritance: what proved the origin of a quarrel that engulfed Hainaut and Flanders.

Also, a cartulary of the said Margaret tells us that in Le Quesnoy at that time there were about six hundred properties, and they measured up to 33m long and 13m wide on the road; there were nine bread ovens in the town that residents were subjected to forced labor, such as to provide firewood to the castle, but in return, they could collect dead wood; in case of war the call to Quercitains would be twenty-four hours after that to the Valenciennes.

But John made the people who had previously dared to make an appeal against him to the Count of Flanders regret their behaviour: many citizens of Hainaut were imprisoned and died in the castle vaults of Le Quesnoy.

The Hundred Years War began and being a vassal state of the Holy Roman Empire, the Count was led to take sides with the Flemish and the King of England against France, despite the family ties binding it to the latter.

The "Chronicles of Jean Froissart" mention the siege as follows: "(1340) .. Those of the town (= the besieged Le Quesnoy) unleashed against them (= the French troops) guns and machinery that threw large paving tiles.

The horses of the attackers were scared by the noise of the artillery which scattered iron and stone projectiles against them that could cause serious injury (equally to the riders), so they in this case against such weapons had no choice but to withdraw.

The French, angry at having been repulsed by the artillery of the town, moved out of spite on the surrounding villages, which they then burned such as Gommegnies, Frasnoy, Château de Potelle, Wargnies-le-Grand, Wargnies-le-Petit.. (Notes 1.)

She married Louis IV, Holy Roman Emperor became a widow of her husband in 1347: when she moved to Le Quesnoy where she stayed until the end of her life, and made the castle her preferred home.

Albert of Bavaria did not entertain good relations with particular subjects of Hainaut, he arrested Sir Sohier of Enghien at a banquet and locked him in Le Quesnoy, for causing him umbrage.

In 1365, civil war sparked in Hainaut, which was ended in 1376, by the promise of Albert of Bavaria to found a mass in the church of Le Quesnoy dedicated to the repose of the soul of the lord executed, as well as providing monetary compensation for his orphans.

Given the extent of the events caused by her third marriage, she left Le Quesnoy and took refuge in Mons, where she was captured and taken to the home of her cousin Philip the Good, Duke of Burgundy in Ghent, which again she escaped.

The nearby Mormal forest served as a refuge to the inhabitants of the villages of Le Quesnoy, who were not too perturbed; although an expeditionary force formed by Jean de Croy had been beaten by the Skinners, who fortunately withdrew after their victory to Champagne.

[10]: 37–39 [11]: 170–173 [13]: 34 [15]: 277 [16] In the 15th Century Le Quesnoy was the ideal holiday resort of the Dukes of Burgundy: they organized lavish parties, and in their moments of relaxation in the country they hunted, their favorite sport, in the nearby Mormal forest which happened to be the specific domain of the Counts of Hainaut.

[10]: 43–45 [11]: 165, 176–177 [15]: 292 According to a survey for the Dukes of Burgundy dated1466 for areas of, the town of Quesnoy was also the seat of a district led by a Provost in the County of Hainaut comprising the following settlements (simply called "villes"): Amfroipret, Batiches, Beaudignies, Beaurain, Berlaimont, Bermerain, Bousies, Briastre, Bry, Busegnies, Caudry, la Chapelle, Croix-Caluyau, Englefontaine, Escarmain, Eth, Fontaine-au-Bois, Forest(-en-Cambresis), Frasnoy, Ghissignies, Gommegnies, Harbegnies (Herbignies : a hamlet situated by the gate of the forest de Mormal), Haveluy, Haussy, Hecq, Jenlain, Le Quesnoy, Louvignies-Quesnoy, Malmaison, Maresches, Marbaix, Maroilles, Molaing, Neuville, Noyelles-sur-Sambre, Orsinval, Poix(-du-Nord), Potelle, Preux-au-Bois, Preux-au-Sart, Raucourt, Robersart, Romeries, Ruesnes, Salesches, St.-Martin, St.-Python, Sassegnies, Sepmeries, Solesmes, Sommaing, Taisnières-en-Thiérache, Vendegies-au-Bois, Vendegies-sur-Ecaillon, Vertain, Villereau, Villers-Pol, Wagnonville (hamlet), Wargnies-le-Grand, Wargnies-le-Petit.

During his reign, Charles the Bold did nothing but make war: his desire was to recreate a single realm, as the former Lotharingia (from which Lorraine is named), between Burgundy and the Netherlands (he envisaged a Burgundian domination from the North Sea to Sicily).

He returned some time later and succeeded after intense bombardment (nearly 900 balls thrown) to take the town, leaving his fair archers to rush through the open breach, but torrential rain halted the fighting.

A conscientious noblewoman and aware of her duchess status as a political contract (cementing the politico-economic links of Burgundy-Netherlands-England), she was an informed advisor to her husband, and after his death, to Mary of Burgundy and Maximilian of Austria, the new sovereigns of the Netherlands and Hainaut.

The invention of these bastions offered shooting in all directions and the stronghold of Quesnoy did not escape this rule hence in 1534, Charles V's engineer, Frate da Modena (Jacopo Seghizzi) drew plans for the refortification and to replace the medieval walls.

These great works monopolized the activity of town residents who took full advantage of this period of relative calm for entertainment with major feasts and festivals of jubilation: we saw for a time here various companies promoted and sponsored by local lords and monasteries with rich costumes and playing drums and trumpets.

Also in 1543, Francis reappeared with an army of 40,000 men and captured Landrecies, Maubeuge and D’Aymeries and Berlaimont castles: establishing his headquarters at the Abbey of Maroilles: these gains were ceded to Charles V under the Treaty of Crépy in 1544.

From 1572, the Protestants supported by the French pillaged the area for several years, because of these facts Sieur Guillaume de Hornes Heze (who realigned with the nobility and the people of Hainaut in dissatisfaction with the Spanish military presence) was executed in 1580 in Le Quesnoy for having attended the Bishop of Cambrai.

But on 4 September 1654 the Vicomte de Turenne, at the head of the French army, stood before Le Quesnoy with a powerful artillery: he seized the town whilst the Spanish before leaving tried to render useless the fortifications by damaging the most out of walls.

[28] This relationship, although one officer left his wife to return Russia, between the town and empire of the Tsars, is also recalled when the Franco-Russian accord became the cornerstone of the alliance system of Third Republic on the eve of the Great War.

[31] Some men led by 2Lt Leslie Cecil Lloyd Averill reached the ramparts of the southern sector where the remains of the sluicegate of the mill in the town and used a ladder to scale the walls.

Constructed to honor the excellence of preparation which remains in the memories of the New Zealand Artillery, for the courage of the soldiers recognized by numerous military citations (over 50 recorded in the London Gazette), and the preservation of the city.

Mayor Daniel Vincent welcomed Marshal Joffre, Lord Milner (a signatory of the Treaty of Versailles), and Sir James Allen, the New Zealand High Commissioner in London as honored guests.

In 1918, the municipality wanted to add a New Zealand Silver Fern to the crest (The Times and The Grey River Argus report the visit of General Hart in November 1918) in gratitude for liberation, but the rules of heraldry have prevented the plan.