It was said that Morgoth's servants feared the Sea, and it's notable that neither he, nor later Sauron, ever had a navy of any sort.
In any case, I don't think it possible that he could have attacked Valinor with any hope of victory without his minions, and it's out of the question that a force that large moving toward the Helcaraxë could have escaped the notice of the Valar.
Of all his servants, only Sauron, and possibly the Balrogs and dragons, could have been any problem for the Valar at all.
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Music alone proves the existence of God.
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