“A handful of men, inured to war, proceed to certain victory, while on the contrary numerous armies of raw and undisciplined troops are but multitudes of men dragged to slaughter.”
Etenim in certamine bellorum exercitata paucitas ad uictoriam promptior est, rudis et indocta multitudo exposita semper ad caedem.
Publius Flavius Vegetius Renatus book De re militari
Book 1
De Re Militari (also Epitoma Rei Militaris), Book I, "The Selection and Training of New Levies"