Guy participated in the Third Crusade as a member of an advance party who initiated the Siege of Acre in the fall of 1189.

[4][5] In 1189, he participated in the Third Crusade as a member of an advance party who initiated the Siege of Acre in the fall of the year.

[1][6][7] After the departure of King Philip Augustus, he stayed in the Holy Land and fought at the Battle of Arsuf.

[6] His name and arms are in the Salles des Croisades of the Palace of Versailles[8] In 1194, Guy fought with Philip Augustus against the English and was at the battle of Fréteval in the rearguard that covered the escape of the King.

In 1202, he participated in the conquest of Normandy and fought at the battle of Mirebeau, the siege of Château Gaillard and the catch of Falaise, Caen, Bayeux and Rouen.