One important aspect to defeating the enemy in Tower Conquest is being able to counter their army line up.
For example, the Kingsmen's Rogue may be able to stealth past your front line defenses, but it can never resist attacking an Undead Radwalker once it gets there - receiving an explosive surprise. Similarly, this tactic also works to counter the Undead army's Leaper - another unit intended to bypass the front lines.
Have a particular counter you'd like to share? Comment below!