I would put money that they were Polish Jews. Various Polish governments in the 1920s and 1930 were hostile to Jews, and depending where they lived many faced local enmity. Lots emigrated, one of the countries most receptive to emigrant Poles was France. France had its own demographic issues after WW1 and Poles in particular were welcomed in mining communities.Holocaust rather than war memorial, but I think this one is the one I’ve remembered most, as it caught me completely off guard whilst exploring the old town of Annecy. Really affected me for some reason, both the unexpectedness of it and having kids the same age.
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How awful that they thought they were moving to a better life, to face that.