Final answer:
During World War I, the French employed soldiers from their colonial holdings in Africa, troops from French Indochina, and soldiers from India to strengthen their armies on the front lines.
Step-by-step explanation:
In World War I, the French employed soldiers from various regions to strengthen their armies on the front lines. They enlisted more than 600,000 soldiers from their colonial holdings in Africa, particularly from West and North Africa. The French also employed troops from French Indochina, with more than 90,000 soldiers brought to Europe, including laborers for the French armies. Additionally, Britain made use of about 1.3 million soldiers from India to fight in the trenches of France.