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3rd to 15th May 1811.
A battle in the The Peninsular Campaign.
Much information on this wiki page and this site.
For a good introduction to the Peninsular Campaign, this site is very good.
See also Duke of Wellington, Napoleon, Frog, French, Sharpe, Badajoz, Salamanca, Talavera and Yet another occasion when the slovenly Frogs were given a richly deserved slapping