Five major food depots had been set up along the path: at White Headland on the Thracian side of the Hellespont, at Tyrodiza in Perinthian territory, at Doriskos at the Evros river estuary where the Asian army was linked up with the Balkan allies, at Eion on the Strymon river, and at Therme, modern-day Thessaloniki. There, food had been sent from Asia for several years in preparation for the campaign. Animals had been bought and fattened, while the local populations had, for several months, been ordered to grind the grains into flour.[103] The Persian army took roughly three months to travel unopposed from the Hellespont to Therme, a journey of about 360 miles (600 km).