More questions about Danube front

[vionville]

Well, my opponnent managed to show more tricks.

1. He blew a bridge that connects two marsh hexes. How did he manage to do that? He had an engineer unit belongs to air mobile brigade, that he flew around to do those dirty works. But shouldn't all engineers blow bridge only on deployed mod?

2. An artillery unit of a czech division, that safely sit in opposite side of danube, suddenly become disrupted. It is in deployed mod. He may have SF unit around, or may not. How did my unit become disrupted?

3. A division headquaters becomes disrupted and seems to take casualty. It agains sit safely in rear area. Again, he may have SF unit around, or not.

4. This is about artillery mine. Until now I fire them with missile unit. My question is, could I fire it with an artillery unit that without WMD ability?

Environment: Night turn. On map strike by air or artillery unit forbidden (The optional rule is not checked).