If you want to build an invincible army that will not lose then follow these Hints!
1. early in the game you need to focus on making large amount of resource gatherers (woodcutters camps, farms, mines, ect.) this will make sure you do not run out of funds early on. (throughout the game at least 25% of you total population should be civilians, even up to 60% early in the game.
2.first research military tech 1 (red), build a barracks, then 2 archers, 2 heavy and 2 light infantry. after this research civic, commerce, and science levels 1 and 2 each. immediately build as many cities as possible. then build up as many non military buildings as possible around each city (farms, universities, temples, ect.).
3. after you have built at least 3 full cities THEN AND ONLY THEN FOCUS ON BUILDING A STRONG MILITARY.
4. this strategy works on AI levels easiest- normal. NOT against human players or hard AI.
Submitted by Marshall Lincoln