Answer:
France and Belgium
Explanation:
The most critical battles of the First World War occurred in the territory of France and Belgium, we can name the following examples:
- Battle of Marne: Two million men participated during September 1914. The French general Joffre managed to stop and break the German lines, which retreated 80 kilometers.
- Battle of Verdún: Held between February and December 1916, it is remembered by the French defense, which resisted until it received reinforcements. 530,000 soldiers died.
- Passchendaele The third battle fought in the Ypres area in July 1917. Despite losing about 400,000 men, the British demolished German defenses.
