["Two of the warriors, of whom I sing, had on their backs their
cuirass and on their heads their casque, and never had night or day
once laid them by, whilst here they were; those arms, by long
practice, were grown as light to bear as a garment"
--Ariosto, Cant., MI. 30.]

the Emperor Caracalla was wont to march on foot, completely armed, at the
head of his army. The Roman infantry always carried not only a morion, a
sword, and a shield (for as to arms, says Cicero, they were so accustomed
to have them always on, that they were no more trouble to them than their
own limbs):

"Arma enim membra militis esse dicunt."

but, moreover, fifteen days' provision, together with a certain number of
stakes, wherewith to fortify their camp, sixty pounds in weight. And
Marius' soldiers, laden at the same rate, were inured to march in order
of battle five leagues in five hours, and sometimes, upon any urgent
occasion, six.

Their military discipline was much ruder than ours, and accordingly
produced much greater effects. The younger Scipio, reforming his army in
Spain, ordered his soldiers to eat standing, and nothing that was drest.
The jeer that was given a Lacedaemonian soldier is marvellously pat to
this purpose, who, in an expedition of war, was reproached for having
been seen under the roof of a house: they were so inured to hardship
that, let the weather be what it would, it was a shame to be seen under
any other cover than the roof of heaven. We should not march our people
very far at that rate.