Food supplies during Persian War

[hoplite14gr]

Well if we belive Herodotus he did not cross from Miletos by he marched to Troas and crossed the Hellespond.
In the thread Xerxes 5,000,000 it was more or less shown that he could not have raised more than 500,000 menat the most. That scales down the cavalry and the pack animals too.
Xerxes was counting more on the logistical support of the allies and subjects than their military support. He took the long march to pass through friently(?) territory. He would carry dried or preserved food and would rely on the cowed locals to provide the rest.
The size of the army made movement slow and after the delay of Thermopylae and the Salamis setback he could not sustain a winter campaign and his army colapsed under his own weight in a nightmarish retreat.
Kind regards