Margaret found that the granting of supplies, even for so necessary a purpose as the raising of troops to resist the raids of Charles of Gelderland, aided by the French king, into Utrecht and Holland, was refused.

She fortunately possessed in a high degree those qualities of persuasive address and sound judgment, which gave to her a foremost place among the diplomatists and rulers of her time.

Such was the confidence that her brilliant abilities inspired that she was deputed both by the Emperor Maximilian and by Ferdinand of Aragon to be their plenipotentiary at the Peace Congress that assembled at Cambray in November, 1508.

Chiefly through her exertions the negotiations had a speedy and successful issue, and the famous treaty known as the League of Cambray was signed on December 10.

By this treaty many of the disputes concerning the rights and prerogatives of the French crown in the Burgundian Netherlands were amicably settled; and it was arranged that Charles of Egmont should be provisionally recognised as Duke of Gelderland on condition that he should give up the towns in Holland that he had captured and withdraw his troops within his own borders.
The extant correspondence between Maximilian and Margaret, which is of the most confidential character, on matters of high policy, is a proof of the high opinion the emperor entertained of his daughter's intelligence and capacity.