How many people from each country went to war in World War 1?

During World War I, the participation of countries varied significantly. Approximately 4.7 million men from the United Kingdom, 3 million from France, 2 million from Germany, and 1.3 million from Russia were mobilized. Other nations, such as Italy, the Austro-Hungarian Empire, and the Ottoman Empire, also contributed significant numbers, with Italy mobilizing around 5 million and Austria-Hungary around 7 million. Overall, an estimated 70 million military personnel were mobilized across all participating nations.