The Xi’an City Wall has four main gates. They each had three sections. Along the outer wall was an archery tower. As the name implies, this first line of defense could produce a shower of arrows from 66 slits. Assuming an enemy breached the entrance, they would rush into a wide courtyard. Not a good place to be! Now they suffered an aerial attack 105 feet above their head from both the archery tower behind them and this gate tower in front. The East Gate is named Changle meaning Eternal Joy. It was built in 1378 during the Ming dynasty.