Under the cover of darkness?

[Ruthrow]

Hi all
Which of the following is more correct:
Under the cover of darkness
or
Under cover of darkness
I did a google and found that both of them are often used (the first with over 5,000,000 mentions) and the second with over 2,000,000 mentions, but i would like to know which of them is grammatically correct.

Thanks.

 

[Rover_KE]

They are both correct.

 

[emsr2d2]

I would omit the article but they are both correct.

 

[Ruthrow]

Thanks

 

[Rover_KE]

Thanks

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