What if the Iceland eruptions that happened in 2010 happened to occur in 1940 just after the fall of France and before the Battle of Britain? What sort of effects would come out of that?
Not much, there's no jet engines to clog up. At most the RAF and Luftwaffe use June and July to fit dust filters over their engines air intakes. Now if Etna, Visuvious or Santerinei blew that would have massive implications on the war in the Med.
Ätna did erupt in 1942. I even saw a picture once, that IIRC showed a couple of allied bombers passing by pretty close.
What if the Iceland eruptions that happened in 2010 happened to occur in 1940 just after the fall of France and before the Battle of Britain? What sort of effects would come out of that?
When I mentioned the Vulcanos in the Med I should have said that the amount of disruption depends on the size of the bang. Santorinei destroyed a whole civilisation and we all know what Vesuvius is capable of. An eruption of those magnitudes could bring operations in the Med to a screeching halt.
If Vesuvius does a '79, there's a pretty good chance that half of Naples gets wiped off the map. This probably doesn't cause the war to end immediately, but the post-war effects are going to be pretty large.
Could any country maintain an overseas war with a disaster of this magnitude at home? If nothing else the morale of you fighting men is going to be not just rock bottom but several miles underground. If this was a result of enemy action things would be diferent but this is an enemy they can't fight.