Cannons are the same as catapults for humans these are the dwarf siege weapon, I don’t really want to bother repeating myself three times as these units are all the same, with the recent patch dwarf cannons now have ammo which means they attack faster at the start and then slower after, this makes them a little more interesting than the catapult or the lich equivalent but still not worth going into detail of each of the academy research bonuses as they are still all the same.

Research for Cannons unlocks at academy level 3

Tier 1: Fitness Training – Flat health increase, leads to Silver Cannons
Tier 2: Combat Training – Flat damage increase, leads to Wall destruction I, which increases damage dealt to walls
Tier 3: Advanced Surival Training – reduces damage cannons take by x%, leads to Expanded ammo capacity which increases cannons ammo held by 10%
Tier 4: Basic Fitness Training – increase health of cannons by x%, leads to Gold Cannons
Tier 5: Advanced Lethality – increase the critical strike chance of cannons by x%, leads to Advanced Agility Training which increases the attack speed of cannons by 10%
Tier 6: Advanced Fitness Training – Increase health of cannons by x%, leads to Wall Destruction II, more wall damage
Tier 7: Building Proficiency – reduces the production time of cannons by x%, leads to Field training: Tundra, which increases the attack and health of cannons by 20% while fighting on snowy battlefields.
Tier 8: Training Discipline – Reduce the gold cost of producing a cannon by x%, leads to Brutal efficiency which reduces the rare resource cost of producing a cannon by 20%
Tier 9: Elite Combat Training – Increase the damage of cannons by x%, leads to weapons research which increases the damage of cannons by another 20%
Tier 10: Elite Lethality – increase the critical strike chance of cannons by x%, leads to Elite Agility Training which increase the attack speed of cannons by 20%
Tier 11: Elite Survival Training – reduce the damage cannons take by x%, leads to Superior Ammo Capacity which increases the ammo held by cannons by 20%
Tier 12: Elite Fitness Training – increase the max health of cannons by x%, leads to Honor Bombardment which increases the honor gained from damaging castle walls by 30%