How did tanks help the Allies break through trench defenses in 1918?

During World War I, the tank emerged as a critical tool for overcoming the stalemate of trench warfare. By 1918, tanks were utilized to break through defensive lines by performing several key tactical functions:

• Overcoming Obstacles: Tanks were capable of driving through barbed wire belts and crossing trenches, sometimes by dropping fascines to bridge gaps.12
• Neutralizing Defenses: They were used to crush or neutralize enemy strongpoints and machine gun positions that had previously decimated infantry attacks.13
• Infantry Support: Tanks served as mobile cover for advancing infantry, providing protection as troops moved across open terrain.1
• Tactical Deception: In addition to their physical presence, tanks were used to lay smoke screens to conceal troop movements.1

While their effectiveness often depended on the number of vehicles deployed—as individual tanks lacked sufficient shock effect—their integration into combined-arms operations, such as at the Battle of Amiens, proved essential in driving the German army back and ultimately ending the war.13