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.
I am pretty sure “Hun” was a way to refer to the Germans in WW1, so a Hun Mine-Layer would be a German who laid mines… But could be totally talking out of my arse so will look it up 😂
Lots of fishing boats and merchant men were used (by all sides) to secretly drop off naval mines during WW1, it became synonymous with someone who is being treacherous and secret sabotaging.
All sides would constantly accuse eachother of secretly laying mines with civilian vessels, and all sides would constantly blame the other for accusing innocent people of laying mines. It was probably a constant source of news articles.
Other way round. The nickname/insult was saying Germans are warlike barbarians like Atila the Hun and the rest of the the Huns.
Kaiser Wilhelm gave a speech encouraging his soldiers to “be huns” on campaign, which led to it being an insult applied to Germans.
‘atilla’ meant something like ‘little Daddy’ in visigothic.
Do with that what you will