The war was fought between two main groups of countries: the Allied Powers against the Central Powers.
Three countries were the original members of the Allied Powers. They entered into an agreement in 1907 in part due to their fears of Germany’s growth as a powerful nation. The tree countries were:
- French Third Republic
- British Empire (United Kingdom of Great Britain and Ireland)
- Russian Empire
France mobilized 8,000,000 men as part of its war effort.
France called upon colonial support, including the participation of the following countries:
- Indochina – 50, 000 troops
- Madagascar – 46,000 troops
- Algeria – 140,000 troops
- Tunisia – 47,000 troops
- Morocco – 24,300 troops
- West Africa – 16,000 troops
Great Britain included armies from England, Scotland and Wales. Including Ireland forces, a total of 4,000,000 personnel were contributed to the war.
The British Empire called upon colonial and dominion support, including from the following countries:
- Australia – 416,800 troops
- New Zealand – 100,000 troops
- Canada – 620,000 troops
- India – 1,500,000 troops
- South Africa – 156,000 troops
- Newfoundland – 8,500 troops
Many territories of the Russian Empire did not exist as individual countries. Names of the territories were instead used to describe regions of land. In total, Russia committed 12,000,000 troops to the war effort.
The Allied Powers included the following countries during the course of the war:
- Belgium – 267,000 troops
- Greece – 230,000 troops
- Italy – 5,615,000 troops
- Japan – 800,000 troops
- Montenegro – 50,000 troops
- Portugal – 65,200 troops
- Romania – 750,000 troops
- Serbia – 707,300 troops
America fought beside the Allied Powers but remained independent. America contributed 4,744,000 troops to the war.
In total, during the war, approximately:
- 5,143,000 Allied Forces died
- 12,801,000 Allied Forces were wounded
- 4,121000 Allied Forces were taken prisoner or missing