By November 1218, Amaury had arrived in Toulouse with an army as part of the Albigensian Crusade. He argued with Simon de Montfort as to the disposition of the army and instead of marching the army to the siege of Toulouse, per Montfort's wishes, the army encamped in "New Toulouse". During the siege of Toulouse, Amaury and numerous other nobles openly criticized Montfort's tactics. The siege was lifted a month later following the death of Montfort.
