What was the significance of the fortress to the french during World War 1?

During World War I, fortresses played a crucial role for the French as strategic defensive positions against German advances. Notably, the fortified city of Verdun became a symbol of French national determination and resilience, enduring one of the longest and bloodiest battles of the war. The fortifications helped to slow enemy progress and protect key supply routes, while also serving as a rallying point for French troops and morale. Ultimately, the defense of such fortresses was vital in maintaining French territory and national identity during the conflict.