Page:Essay on the Principles of Translation - Tytler (1791, 1st ed).djvu/31

a perfect knowledge of the language of the original, and a competent acquaintance with the subject of which it treats. If he is deficient in either of these requisites, he can never be certain of thoroughly comprehending the sense of his author. M. Folard is allowed to have been a great master of the art of war. He undertook to translate Polybius, and to give a commentary illustrating the ancient Tactic, and the practice of the Greeks and Romans, in the attack and defence of fortified places. In this commentary, he endeavours to shew, from the words of his author, and of other ancient writers, that the Greek and Roman engineers knew and practised almost every operation known to the moderns; and that in particular, the mode of approach by parallels and trenches, was perfectly familiarto