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		 While not technically of French heritage, his "military genius" was exhibited and tested while leading the FRENCH army, not the Corsican army (did Corsica even have an army?) 
 
Thus he is described as a French military genius for that reason.  
 
A better way to word it would have been "He was a great military genius of France", naming the country he represented rather than implying he was French, which as you said, he is not. 
 
Capiche? :D 
		
	
		
		
		
		
			
		
		
		
		
	
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