Sort through the letters

You head to your chambers. Once inside, you sit at your desk and sift through papers. One such being a letter, from a Ser Galehaut. You dont recognize the name, he is either new or a foreigner. It's a decree, or rather an issuing of a challenge. Addressed to all eligible knights.

It reads as the following:

"Dear Ser Knight,

I, Ser Galehaut, lord of the Distant Isles, call upon any knight to heed my challenge. Docked on the shores of your country is my grand army, but I wish not to lay ruin to this wonderous domain. Instead, I issue a challenge to every eligible knight.

The challenge shall be selected by the challenger. To the first knight who can best me, I will withdrawal my armies and pledge my allegiance to him. To any knight I may best, he must pledge his allegiance to me.

-Ser Galehaut"

It's certainly an interesting letter... A foreign invader challenging not only you, but all your rivals sounds like an opportunity. If you best this Ser Galehaut, you could make him an ally of your own. Using his allegiance towards securing your power. Possibly even expanding your power.

You decide to travel to the shores where the challenge is being held. Being more than confident in your skills, you needn't fear losing.