Also, there would be no way that the fellowship could have ridden horses over Caradharas. If they were going by the Gap of Rohan, as Boromir wanted, they could have taken horses as the land is obviously suited for horses. Since they didn't want to go by the Gap of Rohan because it took them too close to Isenguard, horses wouldn't have been much use by the terrain they were going.
		 
		
		
		
		
		
		
			
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				His sword was long his lance was keen 
His shining helm afar was seen 
The countless stars of heavens field  
Were mirrored in his silver shield
			 
		
		
		
		
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