All the watchtowers on the city wall of Villingen-Schwenningen are like this, here’s some more I found while on a short walk:


All the watchtowers on the city wall of Villingen-Schwenningen are like this, here’s some more I found while on a short walk:


This was done so that if an archer approaching the tower nocks 5 arrows at the same time, he cannot hit guards in all 5 windows at once.
Later, purposefully-designed bows rendered this defense useless.