How ancient armies, such as the Roman Legions, able to feed themselves during wartime campaigns?

Question

How ancient armies, such as the Roman Legions, able to feed themselves during wartime campaigns?

In: Other

Answer 1

The Ottomans had to ways to deal with this issue.
1. They carried most livestock with the army when they went on campaigns. The livestock were mostly consumed by high ranking officials and the Sultan.
2. The towns on their road and nearby were informed so that the locals would sell them what was needed.