I'll start: https://en.wikipedia.org/wiki/Eight-Nation_Alliance
>The Eight-Nation Alliance was an international military coalition set up in response to the Boxer Rebellion in the Qing Empire of China. The eight nations were the Empire of Japan, the Russian Empire, the British Empire, the French Third Republic, the United States, the German Empire, the Kingdom of Italy and the Austro-Hungarian Empire. In the summer of 1900, when the international legations in Beijing came under attack by Boxer rebels supported by the Qing government, the coalition dispatched their armed forces, in the name of "humanitarian intervention", to defend their respective nations' citizens, as well as a number of Chinese Christians who had taken shelter in the legations. The incident ended with a coalition victory and the signing of the Boxer Protocol.
>>131537944
Battle for Castle Itter
Only battle in WWII where Germans and Americans fought side-by-side.
https://en.wikipedia.org/wiki/Battle_for_Castle_Itter