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Among the defenders were the Austro-Belgian Regiment of Los Rios , commanded by its Colonel Jean Charles Joseph , Count of Merode , Marquis of Deynze ; Charles , 5th Duke of Arenberg ( Jean Charles ' brother-in-law ) References
 Jean Charles Joseph , Count of Merode , Marquis of Deynze, Charles , 5th Duke of Arenberg, Jean
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Answer:
 Jean Charles Joseph , Count of Merode , Marquis of Deynze, Charles , 5th Duke of Arenberg, Jean