It seems fairly certain that the Aragonese concentrated at Lerida. They could not have marched by the great coast road of the Romans, from Barcelona via Perpignan (a town of Pedro’s) to Narbonne, and then west by Carcassonne on Toulouse, inasmuch as de Montfort strongly held the Carcassonne country. Therefore, to march by this, the natural low-grade route of peace-time, would have exposed the King to the probability of having to fight before his junction with his Languedocian allies. Eliminating the main coast road, there remain two possibilities, the Somport and the Cerdagne, and between them there seems to be no direct evidence whatsoever. To move by Huesca, Jaca, the Somport, and so into friendly Bearn by Oloron, would have put it out of de Montfort’s power to harass the march. A phrase in Vaissete, repeated by Luchaire, to the effect that the king “entered Gascony” appears to tell in favour of the Somport hypothesis. So does the fact that the Aragonese entered Toulouse before moving on Muret. Had he moved by the Cerdagne, Muret would have been directly on his line of march to Toulouse. Nevertheless, the probabilities seem to tell in favour of the Cerdagne. In the first place, Belloc states that the Somport was disused (except locally we may imagine) after “... the new civilization of the Middle Ages had set in with the twelfth century....” The southern side of the Somport, which the army would have had to mount, is excessively steep. Moreover, the bulk of Pedro’s army, as we have already seen, was not Aragonese but anti-clerical Catalan. For the Catalans, the Cerdagne was by far the shortest line into Languedoc.