[Ironfist]

1. In the deployment stage, you need to specify the start & end location of the trench when you lay down trench. However, the end location can be outside the deployment range. You can dig trench into enemy territory.

2. I am not sure whether it is designed this way. After you lay down trench in a hex with road or tree, the road or tree is gone. But when you remove trench from that hex, the road or tree won't come back. It can be used to sabotage roads and chop down trees blocking view.