Plus Ultra
Conquistador
I disagree. Military units are spawned at the encampment. The rules would be inconsistent if before an encampment is built, you can't build these units, after the encampment is built, you can build them but if your encampment is destroyed, you can suddenly build them in your city center.
My guess is that if an encampment is destroyed then that city can no longer build military units. You have to rebuild the encampment or "fix it" with a builder to build military units again from that city.
This would make encampments big targets since you could attack the encampments first to cripple the enemy's military production. I think this makes sense.
So, basically, what you are proposing is the new strategy to cripple your neighbour forever is:
-Let him build his first encampment.
-Pillague it before he builds an army. He is no longer able to build any military units.
-No more wars between you as long as you place a unit in the encampment (he cannot fix it)
That makes no sense. He must be able to build military units to fight back (maybe not all of them, and certainly not with the experience the encampment provided).