wikipedia.org

OGlaY TIL that a man inserting a bottle to his anus worsened tensions that led to a war
R5Bk7 TIL that, at one point in time, the Habsburg monarchy (predecessor of Austria-Hungary) occupied the territory of today's Belgium.
W7ZoY TIL about the siege of Dura-Europos, one of history's first use of chemical weapons and tunnel warfare, during the siege the Persians dug tunnels to bypass the Roman walls, Romans dug their own tunnels to reach them and fight them but the Persians released sulphur dioxide in the tunnels, killing 20.