Which country suffered the most casualties in World War I?

1 Answer
Jul 20, 2016

I found Germany with #1,800,000# dead.

Explanation:

According to Michael Howard - The First World War - ISBN 978-85-254-2040-4 we have the following table:
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Although the table is in Portuguese you can see that beside the column of the names of the countries involved you have a column with the population in millions (at the start of the war), a column with the number of soldiers deployed during the hostilities and the last one with the number of deaths.