What is the birthdate of this Anglo-Irish soldier and statesman who was one of the leading military and political figures of the 19th-century Britain, and for which Jean Victor de Constant Rebecque countermanded the order of him to evacuate Dutch troops? 
Jean Victor de Constant Rebecque: Jean Victor baron de Constant Rebecque (22 September 1773 – 12 June 1850) was a Swiss lieutenant-general in Dutch service of French ancestry.
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