 The next year (1210), Aimery assisted Simon in the siege of Minerve, but he refused, on account of the wishes of his subjects, to participate in the siege of Castelnaudary.Aimery may have taken part in the Battle of Las Navas de Tolosa in 1212, where the united armies of Spain, led by Alfonso VIII of Castile, Aimery's homeland, routed the Almohads.It is known that Arnaud Amalric, the Archbishop of Narbonne, took part.