It's the event window. Press the "U" keyboard shortcut or click on an event on the news ticker on the bottom to open it.

Thanks!

ACM is an awful mod. it gives the computer the upper hand in all attack situation, giving the player no chances of winning. it also gives the player an advantage when defending but, when neither player can win an attack situation, the best chance is a stalemate. is there any mods that adds additional factions?