The roman army usually marched 15-20 miles from dawn to midday because at the end of the march they had to compare this march to a distance from your house to a nearby location.

They had to setup camps

Explanation:

The Roman army usually marched 15-20 miles from dawn to midday because at the end of the march they had to setup camps for themselves after such a long march. these marches that the Roman army usually made were part of their endurance training and it also helps them to be mentally sharp as well.

The 15-20 miles march made by the ROMAN ARMY WHEN COMPARED TO a distance from my house to a nearby location is an equivalent of the distance between my house and My former university

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