Shield

Countering blows
To protect ourselves in hand to hand combat or against enemies throwing javelins, arrows, we could try to craft light armors of wood and strong leather that soldiers would carry on one arm to counter blows.

Potential Requirements

 * Obsidian Weaponry or Spear (whichever you research first)
 * Maybe having an army with at least 1 ranged unit (Had situations where shield didn't trigger for a long time when no ranged units were in army) or simply having an army somewhere.