Evil countries are trying to impose upon your land! They are trying to make you adapt new laws and silly regulations that would in the long run hurt the prosperity of your people. Or maybe they were just random wandering soldiers; either way defeat them before they walk the full length of course. Purchase your towers with starting money, and place them down along the path and watch them destroy your enemies. When the enemies start getting tougher and faster, start using your money to upgrade your towers, but defend better against the bigger enemies. Do everything you can to keep your Country safe from tyranny!