Comment 8 for bug 741142

@ Nicolai

(3) Allow to build advanced military buildings if the event mines is triggered (something like this):
To protect your infrastructur build at exposed/strategic important places advanced military buildings like ...

For this idea, the rock cluster at the middle of the map should eventually bigger to grant the player enough ressources to build these prompt.

If there are more questions about the savegames, replay, ... don't hesitate to ask.