The Need For Dirty Faces

In theory, with a big enough army, any battle is winnable by sheer brute force. But ask any general, and you'll quickly find out that the right terrain can make even the largest numerical advantage useless.

And since you can't always choose the terrain, if you want to increase your odds of victory, you need spies. Saboteurs. People willing to get their hands dirty, do questionable things, for the greater good.

Not a pleasant fact, but a true one. No matter what the war.

Now yes, being an angel sabotaging Hell's forces is unusual, but the principal is the same...