Where/How did you learn about Dunkirk?

FOYLE'S WAR, "The White Feather." The primary plot was about the terror of an impending/immediate German invasion. The J.B. Priestly broadcast voiceover at the end was fantastic: "We’ve known them, and laughed at them, these fussy little steamers, all our lives. We have watched them load and unload their crowds of holiday passengers – the gents full of high spirits and bottled beer, the ladies eating pork pies, the children sticky with peppermint rock. But now, look, this little steamer, like all her brave and battered sisters, is immortal. She'll go sailing proudly down the years in the epic of Dunkirk. And our great-grand-children, when they learn how we began this war by snatching glory out of defeat, and then swept on to victory, may also learn how the little holiday steamers made an excursion to hell and came back glorious."