Liechtenstein: Became an independent state and declared permanent neutrality, while maintaining close political ties with Austria. Accused by Bismarck of having manipulated the Confederation Diet vote, the Principality had sent 80 men out on the Imperial side against the Italian volunteers but did not engage in any fighting.[33] There has been a longstanding yet unverified claim that Liechtenstein’s auxiliary force returned home with an extra man, stated either as an “Italian friend” or a defector.[34]
Explanation:
https://en.wikipedia.org/wiki/Austro-Prussian_War#For_the_neutral_German_parties_and_Liechtenstein
Liechtenstein was the real winner of the war: didn’t fight, made a friend, gained independence, never fought again (?).