After the victory in Germe, the Company resumed its march, passing through Chliara and Thyatira and entered the valley of the Hermos River. On their way, they stopped in various places, abusing the Byzantine governors for their lack of courage. Roger de Flor even planned to hang some of them; naming the Bulgarian captain Sausi Crisanislao, who finally obtained a pardon.

Upon learning of the imminent arrival of the Great Company, Bey Yakup bin Ali Şir, head of the coalition of the Turkish troops from the emirates of Germiyan-oğhlu and Aydın-oğhlu, decided to lift the siege of Philadelphia and face the Company in a suitable location (Aulax) with his 8,000 cavalry and 12,000 infantry.

Roger de Flor took command of the Company cavalry, dividing it into three contingents (Alans, Catalans and Romans), while Corbarán of Alet did the same with the infantry. The Catalans achieved a great victory over the Turks in what would come to be known as the Battle of Aulax, with only 500 Turkish infantry and 1,000 cavalrymen managing to escape alive. After this battle de Flor made a triumphant entrance into Philadelphia, being received by its magistrates and the bishop Teolepto.

Having already accomplished the principal mission entrusted to him by the emperor, Roger de Flor decided to consolidate the defence of Philadelphia by conquering the nearby fortresses which had fallen into the hands of the Turks. Thus, the almogavars marched north towards the fortress of Kula, forcing the Turks who were there to flee. The Greek garrison of Kula received de Flor as a liberator, but he, not appreciating how a seemingly impregnable fortress could be allowed to fall into the hands of the Turks without a battle, beheaded the governor and condemned the commander to the gallows. The same harshness was applied when, days later, the almogavars took the fortification of Furnes, located further north. After that, de Flor returned with his troops to Philadelphia to claim payment for his successful campaign.