The army has a move factor of 2.
I'm at war with Kraxis so it cannot use my roads.
I saw it suddenly cross a body of water. It skipped crossing my outpost lands and went directly across the water onto a road. Then it moved 2 tiles into a different outpost land of mine.
A legitimate move would have been along 5 tiles belonging to me plus some unowned road tiles. So they could have legally crossed only 2 tiles.