So I'm playing a game on New World and I think that I'm in complete control of the game after eliminated 2 player in one turn, using 3 sets in that turn and heavily fortifying my territories against attack. Then I look at the game a few hours later and someone with a 22 armies took out over 40 armies in a single turn. Two of these territories were bombarded and annihilated, both of which were stacked with armies.
What I want to know is how the bombardment works, what situations can you use it and how do you select a bombardment attack?