Good day
Engineer units INF or Vehicle when moved beside a mine or other obstacles hex will start to remove them during the other sides' turn. BTW they will remove your stuff too, but you can turn that function off. Inf Eng are good generally for all things including blowing bridges (Satchel Charges). Reg INF will clear stuff too but very slowly. Suppression or use for other jobs will effect how they clear as well.
(E) Hot Key---In scenarios if you are set up to defend your troops will dig in or you can build trenches. Trenches also make fair AT Ditches but they do work both ways. I'll let the link provided tell you of Engineer Vehicles.
Hope this helps.
Bob out
