 France was simultaneously at war with the Duchy of Burgundy.That made Burgundy into theoretical allies of Isabella's supporters, but in practice, it continued its war against France without coordinating their actions with the Isabella alliance.The Kingdom of England was also briefly at war with France with the disembarkation of King Edward IV in Calais in June 1475, but by a quick diplomatic response, Louis negotiated peace with Edward and signed the Treaty of Picquigny in August.