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How did the Duke of Wellington use ridge positions to defend against French attacks in the Peninsular War?

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tactics Sumerian phalanx, a block of foot soldiers depicted standing shield-to-shield, presenting spears, and advancing in a dense mass, detail from the Stele of the Vultures, limestone bas-relief, c. 2450 bce; in the Louvre Museum, Paris.

During the Peninsular War and at the Battle of Waterloo, the Duke of Wellington utilized ridge positions as a core defensive tactic to neutralize French offensive advantages. His approach relied on two primary methods:

Reverse Slope Defense: Wellington frequently positioned the bulk of his infantry on the reverse slope of a ridge. This placement effectively sheltered his troops from direct observation and the devastating effects of French artillery fire, which would otherwise have decimated his lines as they waited for the enemy to approach.1
Terrain Utilization: By occupying the crest of a ridge, Wellington gained command of the valley below. He often enhanced these natural positions with existing landscape features, such as thick hedges, which provided cover for his men. At Waterloo, he further strengthened his line by securing advance posts—specifically the chateau at Hougoumont and the farm at La Haye Sainte—which acted as critical anchors that disrupted French attacks and prevented his center from being flanked.1

This defensive strategy forced French forces to advance uphill into the teeth of British infantry fire, often while their own artillery support was rendered less effective by the terrain.1