Fortify your position with towers. Guard towers are more effective towards flying objects and ground attack due to its faster firing rate.
Cannon towers are more effective against a water attack. Towers will be attacked first by the enemy.
You can increase the speed of your peon or peasant building a structure, by sending an additional peon or peasant to fix that same structure as its being built.
Your magical players are very effective in destroying towers, they are capable of casting spells from a distance.
Try to protect your magical players with your warriors as most towers are surrounded by enemy warriors. When you cast a spell your enemy will attack, you need to protect the spell caster with your own force of warriors.
Protect your fleets and your ports with either an airborne vehicle or any submerged vehicle. Both of these will give you the opportunity to detect other submerged vehicles.
Before you explore to far, build up your force of troops so that if you discover any enemies you will be able to destroy them quicker and with less casualties.
Catapults will kill anything in their way, friend or foe, watch out for your own men.
Upgrade your warriors at the blacksmiths first so that you have a strong force in case of attacks.
Warriors which throw objects are a better defense against an air attack.
