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You should start by building a farm and barracks at the same time, while continuously sending units to mine mostly gold and harvest wood, though a few should do stone (eventually). Keep producing workers early on until you have around ten, then produce military units. Be sure to move all your military units to where ever the foe will come from, so that they will not be able to hit your base before you can attack them.
Focus your units on archers early on, with a few swordsmen. Once you have at least 15 military units, build a blacksmith and do the stable upgrade. Then you can continue, making archers your priority, while adding a guard and horsemen every now and then. After the second attack, and you still have 15+ military units, build a technodrome and produce a technician or two along with all the upgrades.
Now have the technician build an aerodrome, and once done, you can morph technicians into battle machines (once the upgrade is done). Once you have the robotics upgrade, you should also produce as many airships as you can safely afford while maintaining the rest of your army.
Now your base is probably pretty full, and once you have enough units (I'd recommend about 32), select them in groups of 16, then number them and send them to attack. When sending them to attack, it's best to leave about 5+ units behind if against only 1 AI, since there's a possibility of the AI taking an alternative route and slipping past you. Only move your units about 10 tiles at a time, and wait for the slow units to catch up before continuing.
Once you reach the foe's base, quickly have a small group of LAND ONLY units attack any air ballistas or tower of souls, since they will dispose of your airships fast. Then focus all attacks on your foes military units, saving the buildings for last. Once their military units are down, target any defensive buildings, then target their main building before destroying the rest.
Congrats, you've won.
Of course, it's easier with magic, though it takes a higher degree of skill for magic... Still, I've never lost...