Swiss troops invade Liechtenstein
… accidentally. In the night from Wednesday to Thursday, 170 armed Swiss troops crossed into the tiny neighboring Principality of Liechtenstein. They got lost in bad weather in the Alps during a training exercise and strayed a mile into the unarmed principalities sovereign territory. Scrambling to prevent any escalation, both countries immediately launched diplomatic efforts and were able to peacefully resolve this incident.
Oh boy – that was a close one! :)
BTW: Liechtenstein is the only country left with direct historical continuity back to the Holy Roman Empire of the German Nation (The First Reich).