Combat during the ancient times is one of the hardest aspects of the game. The units attack/defense values are so evenly matched that no combat is a sure win. Add to this that the results of one or two combats can change the course of the game at this point, and it makes for one big headache. Also, the human player (at least in my experience) is usually outnumbered pretty badly. I have found that horsemen are a very useful unit, mainly because of the retreat ability. Even though they don't win the combat, they do not necessarily die, keeping you from getting even more badly outnumbered. The other thing I discovered is that it is almost always a bad idea to attack a city unless you have superior numbers, and the ability to take it in one turn. Once you stack units outside an enemy city, the AI seems to somehow get a new spearmen every turn. One spearmen can take out anywhere from 1 to 6 attacking units because of the even attack defense values. Armies of swordsmen seem to be the only way to consistently defeat units defending cities, and this is not always an option. These are my tips, and I am hoping others have some enlightening strategies as well.