Those who remember, will know how effective this structure is from the client games. They hit hard but are somewhat slow to reload and their defense isn't so hot either. It does what's it's meant to do, act as a wall, but an attacking wall! I've seen this things pure potential by attacking other players, this thing at a high level and strong alliance bonus is simply remarkable. If you can get them early, do so as early as possible or you'll kick your own a$$ that you didn't later on.
A few of those behind some tank traps will yield very nice results.
STATS: Defense Points Usage:
15
Range:
2.5
Strongest Against:
Any EnemyVehicle
Weakest Against:
Any Structure Buster
Mammoth Tank
Special Upgrade:
This unit does not have an upgrade yet
Upgrade Research Cost:
N/A
Defense Research Costs:
Credits: $180,000
Research: 470,000
The Guardian Cannon is a beast against any tank and is the best deterrent for Mammoth Tanks. I use at least 2 per base, either 2 or three depending on the base's play style. They are costly to upgrade later on but it's well worth investing in them.