I never did understand the “Hun” thing...
Kaiser Wilhelm made a speech to German soldiers going off to fight the Boxer Rebellion in China, and said:
When you come upon the enemy, smite him. Pardon will not be given. Prisoners will not be taken. Whoever falls into your hands is forfeit. Once, a thousand years ago, the Huns under their King Attila made a name for themselves, one still potent in legend and tradition. May you in this way make the name German remembered in China for a thousand years so that no Chinaman will ever again dare to even squint at a German!
The British remembered the speech later when they went to war with Germany.