Explosive artillery ended the era of fortified structures above ground.

Evidence

Exploding artillery spelled the end for even these forts. From WWII onward the safest place to hide has been in dispersed bunkers deep belowground, like Cheyenne Mountain, headquarters of NORAD during the Cold War. — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 974

Categorization

  • XREF: connects to: Round towers replaced square ones because corners were vulnerable to artillery; Cannons ended the castle arms race, making thousands obsolete — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 519; Trebuchets made square castle towers disappear in favor of round ones — Emlen, Douglas J, Animal Weapons_ The Evolution of Battle, 516 (+3 more)

Broader Connections