This association with the influential house of Croÿ proved very favorable for Ligne's reputation.
After Charles' death he enlisted in Maximilian's service and fought against the French at the Battle of Guinegate (1479), where he was captured.
To pay the ransom of 9,000 ecu, he sold the seigniory of Woelingen to Godfried van Gavere.
At the conclusion of the Treaty of Arras (1482), it was Jean of Ligne who officially placed the toddler Margaret of Austria in the hands of the French to be married to the Dauphin.
After the resumption of hostilities, Jean defeated the French and recaptured the castle of Oudenaarde (1484).