We assure you this isn't pulled from somebody's DeviantArt portfolio -- it's an honest-to-goodness 15th-century woodcut scene from St. Augustine's City of God.
Johann Amerbach, via io9.com
It's a city of God and Halo villains, apparently.
The use of incendiary devices in warfare has been recorded as far back as the year 904 in China. That's right: people were shooting at each other before the Western calendar even reached quadruple digits. Chinese artists also loved hiding gat-packing demons in their artwork, like the one at the top-right corner of this 10th-century illustration, trying to bust a cap in the Buddha.
The only "enlightenment" here is that snake-headed dude "en-lighting" your ass up.