In World War 1 how many troops were involved from each country?

During World War I, the troop contributions varied significantly among the major powers. The Allies had substantial forces, with approximately 7 million troops from Russia, around 5 million from France, and about 4 million from the British Empire, including soldiers from Canada, Australia, and India. The Central Powers, led by Germany, mobilized around 4.5 million troops, while Austria-Hungary contributed about 3 million. Other nations also participated, but these figures highlight the scale of the main combatants' mobilizations.