King`s Bounty: Warriors of the North announced

[Rah]

More on unit specialization:

Siege units have the Guard ability - this means they could be assigned to guard an adjacent friendly stack - this could happen before the battle (via special menu), in the tactics mode, or changed in every round - activated ability when Siege units do not move.

Siege unit guarding a stack of spellcasters:

Enemy moves and tries to attack directly the spellcasters - what happens is that the Siege guards attack the enemy, enemy unit retaliates and its attack is wasted on the Guards, it does not attack the spellcasters. This gives the possibility to cover weak units with stronger ones. Siege guards could do this once per round and only if the enemy moves to the guarded stack, if enemy unit is already adjacent to it (from the previous round), guarding does not happen.

Archers: defensive fire, activated ability for ALL ranged units, when activated it lasts until end of battle or when the defended stack moves and it uses all AP for that round of archers.
In this example archers are defending an adjancent stack, when enemy comes and attacks the guarded stack, archers shot at enemy, enemy attacks the guarded stack and than its attack is retaliated - enemy suffers double damage. Only one defensive fire per round per stack of archers is allowed and only if the archers could normally shoot - i.e. no enemies around them - some archers could have the point blank shot ability, which enables them to shoot even if enemies are around.

Siege units could defend Archers and Archers could defend Siege units - this is just an example for synergy.

Spellcasters attacked:
All spellcasters that have magic bolt attack (or ranged magical attack) when enemy rushes on them, and the spellcasters could retaliate, spellcasters have first strike ability - this comes from their training in the magical arts. If the enemy is attacking them without moving prior that, this does not happen - retaliation is normal.

Flyers attacked:
When Flyers are not covered (no enemies adjacent to them), they float in air and take only half damage, than retaliate normally.

Cavalry could have the Trample ability - when attacking in a straight line and 3 or more hexes between them and their target - they could damage adjacent enemy units that are near that line - for 1/5 of their damage. Cavalry has the Charge bonus +10% more damage per hex.