Upgrades

Speed Training

Increases the movement speed of all units by 10%. This can make it harder for the enemy to block all the channels you are attacking, especially in charges. Makes charging down ranged attackers easier.

Increased Armour

Add 10 hit points to all your units making them tougher to kill.

Marksmanship

Increases the accuracy of ranged units, meaning arrows etc are more likely to hit the target.

Spear Training

Increases the damage done by spears by 5

Swordsmanship

Increases the damage done by swords by 5

Halberd Training

Increases the damage done by halberds by 5

Axe Training

Increases the damage done by axes by 5

Race Specific Unit Upgrades

Lots of people have asked about which upgrades effect which race specific units or if they can be upgraded at all. The answers are revealed below:

Battle Axeman - Axe Training

Ranger - Marksmanship

Axe Thrower - Marksmanship

Flailer - Cannot be upgraded

Giant Troll - Cannot be upgraded

Javelin Thrower - Marksmanship

Kings Guard - Swordsmanship

Whirler - Halberd Training

Spearmaster - Spear Training