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			Indeed fire on boats is seriously bad news (despite the abundance of available water) - but we have to assume that Sauron's skills as a tactician are superior to that  (though there  is a theory that military intelligence is an oxymoron - but my pa would kill me for saying that!).  Almost feel a bit sorry for the Nazgul - can you imagin hopw bad they would feel if they can't ford a river but get forced to fly miles over the sea.
		 
				__________________ “But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
 Christopher Tolkien, Requiescat in pace
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