Harun himself, with the other half of his forces, went west and captured the strongly fortified city of Herakleia after a month-long siege in August or September. The city was plundered and razed, and its inhabitants enslaved and deported to the Caliphate. The fall of Herakleia was considered by the Arab chroniclers the most significant achievement of Harun's expeditions against the Byzantines, and is the central event in the narratives of Harun's retaliatory campaign against Nikephoros. As the historian Marius Canard remarks, "for the Arabs the capture of Herakleia had an impact as profound as the Sack of Amorium in 838", which is completely at odds with the city's actual importance. Indeed, the Byzantine sources do not place any particular emphasis on the fall of Herakleia compared to the other fortresses captured during Harun's 806 campaign.