You have the rebellious Watchers [sons of God] to thank for [the acceleration of] technology in War.

Asael taught men to make swords of iron and weapons and shields and breastplates and every instrument of war.

- 1 Enoch 25

This was part of the exchange in knowledge with mankind for wives to create divine hybrids [Nephilim].

These and all the others with them took for themselves wives from among them such as they chose. And they began to go in to them, and to defile themselves through them, and to teach them sorcery and charms, and to reveal to them the cutting of roots and plants.

- 1 Enoch 24