So, it was like this: I had just found a new continent that was pretty empty: there was only me (Tokugawa), Victoria and Bismarck. I was at war with Victoria already so i destroyed him easily from there, before she even got to settle down. Bismarck was a bit trickier: i destroyed his only city there and then made a peace with him (he was a bit afraid i think ). Few turns later i noticed that my "mine was destroyed by a marauding bomber" and i of course started to wonder what happened. But i saw no one and continued. Then it happened again: two farms and that same mine were destroyed again. Then i started to look around and noticed that there was a German- city and inside it there was atleast six bombers! So i checked if we were in war (if would have missed it or something), but we weren't. He was just annoyed towards me! How could he have done it without raising a war?!? There was no other cities around!