Quatre Bras (käˈtrə bräˈ) [key], village, Walloon Brabant prov., central Belgium, just south of Waterloo. There, on June 16, 1815, in a battle of the Waterloo campaign, the British under Arthur Wellington gradually repulsed the French under Michel Ney. However, Ney prevented Wellington's forces from aiding those of Blücher against Napoleon I at Ligny.
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