In a version of Akallabeth it is stated that:
Quote:
Originally Posted by The fall of Numenor, Sauron Defeated, HoME IX
And they encompassed Avallon; and it is said that the Elves mourned and sickness came upon them, for the light of Valinor was cut off by the cloud of the Numenoreans. Then Tar-kalion assailed the shores of Valinor, and he cast forth bolts of thunder, and fire came upon Tuna, and flame and smoke rose about Taniquetil.
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Having said that, I really doubt that the numenoreans could have defeated the valarin forces - but collateral damage was pretty much unavoidable.