Anne of Beaujeu (regent to C8) plans to marry him to Anne of burgundy as Duke Francis II has no male heir, meaning she wants to push France's historic expansionist policy
in 1486, Duke Francis arranges for Anne to marry Maximillian causing Anne of Beaujeu to send an army to Brittany. Maximillian responded by sending 1500 troops to help his father-in-law, and Ferdinand of Aragon to send 1000 troops to help
Henry sent unofficial aid (500 mercenaries led by lord scales) due to his moral obligation to Brittany, and disowns Scales afterwards, maintaining peace with France
After France won at St Aubin Du Cormier, Duke Francis II signed the treaty of Sable, where his daughter could not marry without the french King's permission. Charles VIII married Anne of Brittany in December 1491