Where were the critical World War I battles fought?

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.

The critical World War I battles were fought primarily along the trench lines of France and Belgium.