Clever, Jonathan.
Here's my idea, based on an EU4 run as Burgundy, with a blend of historical flavor:
10 November 1444 - Charles Martin, son of Phillip 'the Good', Duke of Burgundy, celebrates his 11th birthday in Bruges.
11 November 1444 - Phillip declares war on France, allegedly in repentance for the Treaty of Arras.
12 November 1444 - Phillip DIES (punishment for his unscrupulous affairs with more than a dozen mistresses), leaving the vast jumble of titles that was the Duchy of Burgundy to Charles.
13 November 1444 - Charles' regents, his bastard-brothers Courneille and Anthony, employ a rich Flemish banker to assist in the duchy's finances. This self-proclaimed 'Master of the Mint' recommends the origination of a massive loan, worth five hundred times the duke's monthly gross income, in order to finance the war with France.
14 November 1444 - While the armies of France are occupied with the sieges of Normandy and Gascony, a massive force is raised in the Burgundian Lowlands---a combined force of forty-thousand; eleven thousand mounted knights, sergeants and squires, and twenty-nine thousand infantry levies and mercenaries.
~December 1444 - Rouen falls to the French after an unprecedented assault led by Jean Bureau, who, without regrouping or consolidating his force, immediately marches west toward Caen. The Burgundian army marches on Paris, while another mercenary force is raised in Flanders
~January 1445 - In the dead of winter, the Burgundian army makes camp outside the walls of Paris. Three thousand die of exposure. Yet another mercenary force is raised.
~February 1445 - After a sustained barrage by captured French artillery, the frost-bitten Burgundian army assaults the city. Bolstered by mercenary reinforcements, the city falls to within the month. The army is consolidated. The 'Sack of Paris' ensues; mercenaries plunder the city of its riches and women. The city burns for weeks, providing warmth to the triumphant Burgundian forces.
~March 1445 - The main Burgundian army departs from Paris, while mercenary forces are broken off and allowed to plunder the countryside of ducal Champagne. The 'Bastard Brothers', Courneille and Anthony, meet the French forces, weary from battle with the English, outside Orleans. The French are decisively defeated.
~April 1445 - Courneille and Anthony pursue and finally destroy the defeated French army. Many nobility are captured. Jean Bureau is killed in personal combat with Courneille. In the Lowlands, additional mercenary companies are employed by Burgundy and sent to capture Alencon, Orleans, Berry, and Bourbon
~May - November 1445 - While the Burgundian prevents another major French force from being raised, mercenary forces lay waste to the French countryside. Most of northern France falls to Burgundy.
11 November 1445 - One year, to the day, after declaring war, Courneille and Anthony negotiate peace with France on behalf of Charles, who is present at the peace talks but does not speak up. France cedes ducal Champagne and agrees to pay war reparations for ten years.
Three years later, upon reaching his majority, Charles assumes his father's titles, as well as the massive debt incurred by his bastard brothers. To alleviate the financial burden on the duchy, he orders the disbanding of the standing army, much to the chagrin of his brothers and pretty much everyone else in his court. The Holy Roman Emperor and the King of England declare separate wars on Burgundy almost immediately, and are joined in coalition by most of western Europe. Charles, without [much of] a standing army and very much in debt, can do nothing while armies of varying sizes do to the Burgundian lands what his brothers' forces had done to France, only worse.
Charles is dragged out of his castle in Bruges and executed by the Emperor himself, who claims his lands and agrees to split them with the King of France.
By 1450, the Duchy of Burgundy ceases to exist as an autonomous entity.