On June 28, 1919, the day this was printed, the Treaty of Versailles was signed in France ending the state of war between Germany and the Allied Powers of World War I. That’s the context for the “hun mine-layer” comment.
20 points
Kaiser Wilhelm gave a speech encouraging his soldiers to “be huns” on campaign, which led to it being an insult applied to Germans.
17 points
12 points
*
8 points
Ehhh yes, but the stereotype already existed before that speech: https://en.m.wikipedia.org/wiki/Hun_speech