In 2007 Swiss army unit mistakenly invaded Liechtenstein
The traditionally neutral Swiss army staged an unplanned invasion back in 2007 after its troops blundered into Liechtenstein. A 171-strong Swiss company got two kilometres into its neighbour before realising the mistake and heading back. Liechtenstein authorities made light of the intrusion, saying they only knew about it when the Swiss told them.
A spokesman for the Liechtenstein authorities said: "It's not like they invaded with attack helicopters."