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How did tanks contribute to the British breakthrough at the Battle of Cambrai in 1917?

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Kuwait: U.S. 1st Armored Division M1A1 Abrams tanks — tank M1A1 Abrams main battle tanks of the U.S. 1st Armored Division moving across the desert in northern Kuwait during the Persian Gulf War, February 1991.

At the Battle of Cambrai in 1917, tanks were instrumental in achieving a breakthrough by enabling a surprise assault without the need for a traditional, lengthy artillery bombardment.12

By omitting a preparatory bombardment, the British successfully avoided alerting German forces to the impending attack. The rolling terrain near Cambrai was well-suited for tank movement, allowing a "swarm" of hundreds of tanks to lead the infantry assault on November 20. This massed use of armor allowed the British to rip through German defenses in depth, achieving a significantly deeper penetration at a lower cost in casualties than previous offensives on the Western Front.12

Although the British were ultimately unable to fully exploit this initial success due to a lack of timely reinforcements and subsequent German counterattacks, the battle served as a historic demonstration that the combination of surprise and tanks could effectively unlock the stalemate of trench warfare.12