For a long while it was The Raven by the Stranglers due to the name and the context of black and white.
But recently this song comes to mind when thinking Invasions and Skirmishes, and when I hear it, I think of Corvus in battle, so it has to be the one:
https://www.youtube.com/watch?v=SBjQ9tuuTJQ&list=PL0LnWnL-0hb7gGwn_bw8vrrauP4JeABdE
'I'm the voice inside your head
You refuse to hear
I'm the face that you have to face
Mirrored in your stare
I'm what's left, I'm what's right
I'm the enemy
I'm the hand that will take you down
Bring you to your knees
So who are you?
Yeah, who are you?
Yeah, who are you?
Yeah, who are you?'
'What if I say I'm not like the others?
(Keep you in the dark)
What if I say I'm not just another one of your plays?
(You know they all... pretend)
You're the pretender
What if I say I will never surrender?
So who are you?
Yeah, who are you?
Yeah, who are you?'