 The Yamamoto was bringing them in from everywhere and putting the whole of his fleet together and it was much bigger than anything the Americans had in the Pacific. The question was where are they going to attack? The code breakers were reading, it depended. In some cases you could read even half of a message. In other cases all you could make out was that a message had been sent. Very, very seldom you could read as much as ninety percent in a message. But you put the whole thing together,