Why didn't Sauron use the Numenorean army?

[CAB]

Towards the end of the Second Age, the Numenoreans had become a very formidable military force. When Ar Pharazon confronted Sauron, Sauron’s own servants deserted him and he was taken as a prisoner to Numenor. After a few years Sauron gained control of Pharazon and through him the Numenorean military. My question is: Why didn’t Sauron use this army against his enemies in Middle Earth, primarily the Elves and Faithful Numenoreans? The Numenoreans in Ar Pharazon’s time surely could have destroyed or enslaved them. Instead, Sauron willingly destroyed his new forces by sending them against the Valar. He knew quite well that this would be their end. Why would he do this?