GERMANY Brandenburg-Prussia 1892 Wilhelm II silver Triple Alliance Medal  38.7mm silver medal 20.48 grams Struck in commemoration of the alliance between the German Empire, the Austro-Hungarian Empire, and the Kingdom of Italy. (Marienburg-6986)

Obverse: three conjoined busts facing right, WILHLEM II FRANZ JOSEPH I HUMBERT I

Reverse: three conjoined arms with oak branches, EINIGKEIT / MACHT STARK /
1892 (Trans: Together We Are Stronger)

Link below gives the details of the Triple Alliance formed in 1882

https://en.wikipedia.org/wiki/Triple_Alliance_(1882)

An impossibly complex web of alliances that maintained a fragile peace in Europe always threatened to unravel. Chief among them was the Triple Alliance of 1882 among Germany, Austro-Hungary, and Italy, in which each member agreed to defend the others in war.

The 1914 assassination of Archduke Franz Ferdinand, the heir to the Austrian throne, by Serbian nationalists, made Austria declare war on Serbia. A doomsday machine kicked into gear: Russia mobilized against Austria. Germany mobilized against Russia. France mobilized against Germany. Germany prepared long-held plans to attack France.