The event I am talking is "Disaster" which reduces a cap to a city or a city to nothing.
What if you have the empire "Persia" which allows you to gain 1 army whenever you reduce a capital.
Now, if I play Persia, can I then play Disaster and reduce a capital to a city and gain 1 army?
I would say the spirit of the rule would be no. Being that it should happen through combat.
However, that is just my opinion.
The easy way to play it would be yes you do