(c.

16.)] [Footnote 57: Tacit.Annal.iv.5.Those who fix a regular proportion of as many foot, and twice as many horse, confound the auxiliaries of the emperors with the Italian allies of the republic.] [Footnote 58: Vegetius, ii.2.Arrian, in his order of march and battle against the Alani.] [Footnote 59: The subject of the ancient machines is treated with great knowledge and ingenuity by the Chevalier Folard, (Polybe, tom.ii.

p.
233-290.) He prefers them in many respects to our modern cannon and mortars.

We may observe, that the use of them in the field gradually became more prevalent, in proportion as personal valor and military skill declined with the Roman empire.

When men were no longer found, their place was supplied by machines.