How do you evict a homeless encampment on undeveloped woods.

[Matthew Paul]

One of my customers lives out of state , but he owns a 20 acre undeveloped parcel of woods near a low income area . Someone contacted him and told him there were 3 old travel trailers and about 10 tents set up about 200 yards in his woods .  I went and confirmed it . There were about 15 people there .  I told him I could put up new " no trespassing " signs for him , after that he could call the police .   " How does one evict from the woods ?