We're shooting at our allies and they're shooting back.

There have been at least a half dozen strikes by predator aircraft inside Pakistan since Sept. 1st; these strikes are considered to be a violation of Pakistani sovereignty by the Pakistanis. In fact, the Pakistanis have ordered their forces to fire upon American aircraft and they have done so.

My question is twofold: Has there ever been a precedent, where allies are firing upon each other under orders? i.e not ‘friendly fire’

How long can this go on before we have an actual ‘blue on blue’ firefight?

Not too long, apparently…

Pakistani and American Troops Exchange Fire

Another story:
Pakistani troops fire on US helicopters at border

This sounds like the tactics that the Georgians employed on the Russians in Ossetia a few weeks back.