A footnote, with comparandum.

As I think will soon become very irritatingly apparent, I've picked up Gibbon's (divine, says Noel Coward) Decline and Fall after two years of enduring its silent recriminations from my bookshelf. A footnote to his description of Roman siege weaponry ("military engines ... all of which, either in an oblique or horizontal manner, discharged stones and darts with irresistible violence" [!]) caught my eye and reminded me of Minivier Cheevy, whom we all know:

Minivier cursed the commonplace
      And eyed a khaki suit with loathing;
He missed the mediæval grace
      Of iron clothing. (21-24)

The charming annotation in question comes on page 12 of my edition (Heritage 1946), practically meaningless to you since display editions of this work are promulgated with the same metastatic commercial glee as are Gray's Anatomy and Paradise Lost. Woe to display editions and their fate, laudandis, ornandis, tollendisque! In any event, it's footnote 16:

The subject of the ancient machines is treated with great knowledge and ingenuity by the Chevalier Folard. 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 valour and military skill declined with the Roman empire. When men were no longer found, their place was supplied by machines. (Emphasis mine.)

In any event, G-d grant Cheevy his iron clothing and Folard his engines with their oblique (or horizontal!) discharge.