My Parents met via WW2
Dad had been engaged but decided he wouldn't marry until the war had finished, just in case anything happened he didn't want to leave a widow and perhaps young family behind. Alas his intended decided she could wait, and sent him a Dear John letter, and married a chap who reportedly was a bank clerk!
His intended worked for the Telephone exchange in a nearby town with my mum, she asked mum to be his Pen Friend, to cheer him up. So they started to write to each other. As the war closed my dad's duties were to escort various German officers back to the Officer POW camp nearby, On one trip he arranged to meet my mum at the Train Station, they met and the rest is history.
If it hadn't been for the war it is unlikely that my parents would have met at all