Never, never, never, never. Identify before entrance - always. The $69 remote camera you can buy at Home Depot connected up to cheap monitor works just fine.
And if they decide to break the door down - PLEASE DO. Forcible entry justifies deadly force in most states. And God wouldn't have invented the 12 gage if he didn't want it used.
With a yard full of LEOs? Yeah, you go, Rambo.
Did you read the article?
Resistance would have resulted in Alamo-like scenario.
Um, if they holler that they are police then your court viewed rights apparently go away. Even if they are not police.
Nothing you can do on a worldly plane will prevail against the satanic.