Ohhh very interesting thread!
From my mother's side, my grandpa fought in WW2 for the germans. He was sent to Russia and there he was caught and sent for the rest of the war in a prison where he met a polish man (named something like Olchewsky, but I'm not sure how to write it) who was his jailer, but they became friends. My grandmother was sent to Alsace while british aircraft almost bombed to the ground her home city.
From my father's side, my grand parents were both italians born under the Austro-Hungarian rule in South Tirol and during WW1 they escaped from the front lines (when Italy declared war) to Moravia where they stayed for the duration of the war (they were childs).
My grand mother learned a recipe that she called "Smorum" that is like an italianization of (we discovered only recently) "Kaiserschmarrn" which apparently was the favourite recipe of the Emperor.
When they came back the region where they lived was ceded to Italy.
Between the wars my grandfather made a living out of searching bombs and materials from the war and sell them.
When WW2 started he was already too old to go to war (yeah he was lucky enough to see them both but never fight XD).