Army grouping
     From  the  start  of  the game up until the end, the enemy always
spreads troops out. If you try this at the beginning of the game, your
army  will be destroyed. Instead, when selecting units in battle, send
the  entire  army  together.  They will help each other fight and live
through  the  battles.  Always  send  your  army  as one large team to
obliterate the enemy.

Upgrades
     When upgrading, always upgrade the Archers first. The Archer will
attack  from  a  distance.  First,  upgrade Archer Health, then Archer
Attack/Power,  and  finally Archer Speed. When your Archer's abilities
are  maxed,  they will do the most damage and kill enemies with little
to no casualties. Then, focus on the abilities of the Spear-Men. After
them, strengthen your Swordsmen.