…To see trenches in dreams, warns you of distant treachery. You will sustain loss if not careful in undertaking new enterprises, or associating with strangers. To see filled trenches, denotes many anxieties are gathering around you. See Ditch….
Dream dictionary: Trenches dream meanings
If you dream of trenches, then such dream warns you to be careful with people you do not know, otherwise you will get to poverty and loses.