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In Britain at least, a lot of the young men who fought didn't actually have a vote at that time, "Only 58% of the adult male population was eligible to vote before 1918. An influential consideration, in addition to the suffrage movement and the growth of the Labour Party, was the fact that only men who had been resident in the country for 12 months prior to a general election were entitled to vote.

This effectively disenfranchised a large number of troops who had been serving overseas in the war. With a general election imminent, politicians were persuaded to extend the vote to all men and some women at long last."

and this lead to the Fourth Reform/Representation of the People Act in 1918.

https://en.wikipedia.org/wiki/Representation_of_the_People_A... https://www.parliament.uk/about/living-heritage/transforming...