: Select units from the side and click in an available spot to place them.
Prevent the undead from moving through this sector by any means necessary. Place units to stop them, but careful not too lose too many in the process.
- Place units on top of things to keep them from being harmed by the undead.
- Upgrade units for greater effectiveness.
- Concentrate attacks on areas where units are vulnerable to attack. Kill them before they kill you.