Defensive Unit

Defensive Units are built from the Wall. Each unit uses one or more spaces, either Wall Defense spaces, or Field Defense spaces. The level of the wall determines how many spaces are available for defensive units. The total number of spaces provided by the wall is split evenly between Wall Defense and Field Defense. (e.g. a Level 9 wall provides 45000 Defensive Unit spaces, split into 22500 Wall Defense spaces and 22500 Field Defense spaces.)

Unlike Troops, Defensive Units do not consume food. As of the April 16th update, they now contribute to the total might of the City.

Defensive Units will always defend your city, even if the army is hiding in Sanctuary. There is currently no way for the owner to deconstruct or destroy defensive units once they have been built. (Obviously enemy attacks can destroy defensive units.)

Wall Defenses

Image	Name	Attack	Defense	Life	Range	Cost Food Wood Stone Ore	Space	Might	Construction and Research Requirements
	Wall-Mounted Crossbows	600	60	2000	1300	250 2000 750 500	2	4	Lv.6 Wall Lv.6 Blacksmith Lv.5 Fletching
High powered crossbows mounted at the best vantage point for shooting enemies.
	Defensive Trebuchet	2550	0	0	5000	500 3500 1800 1200	4	7	Lv.8 Wall Lv.8 Blacksmith Lv.7 Fletching Lv.7 Geometry
Excellent at destroying enemy siege weapons, a trebuchet will only get one shot per battle and must then be rebuilt and reloaded.

Field Defenses

Image	Name	Attack	Defense	Life	Range	Cost Food Wood Stone Ore	Space	Might	Construction and Research Requirements
	Caltrops	650	0	150	0	100 0 0 400	1	1	Lv.1 Wall Lv.1 Metal Alloys
Stops infantry troops from advancing until they are cleared. Positioned at the maximum attack range of the defenders.
	Spiked Barrier	1000	50	100	0	150 750 50 0	3	2	Lv.2 Wall Lv.2 Blacksmith Lv.2 Logging
Stops horse units (including siege weapons) from advancing until they are cleared. Positioned at the maximum attack range of the defenders.
	Trap	1500	0	0	0	400 800 200 400	4	3	Lv.4 Wall Lv.4 Blacksmith Lv.2 Poisoned Edge
Much like the modern land mine, these traps are buried around the castle, and deal damage to unsuspecting enemy attackers.

Defensive Strategy

Caltrops

• the purpose of caltrops is to slow the attackers at maximum range while the army and other defenses attack them at range
• caltrops do very little damage, they rarely kill troops alone
• caltrops are completely ignored by cavalry, supply wagons, and Siege Engines, they move right past.
• caltrops should be used with archers and other range troops defending your city, or with wall-mounted crossbows

Spiked Barriers

• spiked barriers stop both types of cavalry, Siege Engines, and supply wagons until they are destroyed
• spiked barriers do some damage - they can easily wipeout supply wagons if they are ignored
• spiked barriers are completely ignored by infantry troops - they walk right past
• like caltrops, spiked barriers work best when holding enemy attackers at range for your other troops and defenses

Traps

• traps are single-use defenses - they will be destroyed when they attack enemy troops
• traps do a lot of damage, nearly guaranteeing that the attackers will take some losses

Wall-Mounted Crossbows

• crossbows are very effective defensive units - they do much more damage than archers, and they have a longer range
• crossbows work very well with caltrops and spiked barriers to hold the enemy at their long range
• crossbows have shorter range than ballista and catapults, so they are suceptible to attacks from these units

Defensive Trebuchets

• trebuchets will only attack Siege Engines
• trebuchets will completely ignore all other units, including supply wagons
• trebuchets have an enormous range and very high damage, virtually guaranteeing that it will destroy an enemy siege engine before it can get into range
• trebuchets are single-use defenses - they will be destroyed when they fire upon an enemy siege engine