Liechtenstein - Wikipedia

Liechtenstein follows a policy of neutrality and is one of the few countries in the world that maintain no military. The army was abolished soon after the Austro-Prussian War of 1866, in which Liechtenstein fielded an army of 80 men, although they were not involved in any fighting. The demise of the German Confederation in that war freed Liechtenstein from its international obligation to maintain an army, and parliament seized this opportunity and refused to provide funding for one. The Prince objected, as such a move would leave the country defenceless, but relented on 12 February 1868 and disbanded the force. The last soldier to serve under the colors of Liechtenstein died in 1939 at age 95.[68]

During the 1980s the Swiss army fired off shells during an exercise and mistakenly burned a patch of forest inside Liechtenstein. The incident was said to have been resolved "over a case of white wine".[65]

In March 2007, a 170-man Swiss infantry unit got lost during a training exercise and inadvertently crossed 1.5 km (0.9 miles) into Liechtenstein. The accidental invasion ended when the unit realized their mistake and turned back.[69] The Swiss army later informed Liechtenstein of the incursion and offered official apologies,[70] to which an internal ministry spokesperson responded, "No problem, these things happen."[71]
https://en.wikipedia.org/wiki/Liechtenstein