Silence101
King
...Or I could just build one spearman to put in the stack of Phalanx and it'd do an even more efficient job against the chariots. Plus, that spearman would continue to protect my stack once the enemy discovers horseback riding, which the Phalanx would not.
I thought you'd go down this road (BTW, I said stack of axemen... not phalanx). However, assuming that I'm understanding you correctly, then you are correct - you'd build a balanced military attack force, wouldn't you? Instead of attacking with 8 axemen, you throw in a spearmen to "balance" your military and protect against weaknesses. Now I have a couple of points to make:
1) You build 8 axemen and 1 spearmen. Your spearmen will likely not be attacking enemy cities because... well, it would get slaughtered. For the same production numbers, I build 9 phalanx. I have 9 city attackers.
2) Your spearmen will likely come out on top for the first few battles in which your opponent starts throwing chariots at you. If you should lose that one spearmen, your opponent has found a "breakpoint" in your stack, in which it is no longer balanced. Any remaining enemy chariots are going to have a field day with your axemen. With my 9 phalanx, I don't have that problem. If I should happen to lose a phalanx here or there, I will still maintain a balanced attack force. The lack of "breakpoints" in a phalanx stack makes them very strong - simply because there's no foreseeable weakness to exploit.
3) Horseback riding would provide the first unit with any type of counter to phalanx. However, it doesn't come early, it's expensive for an early game beeline, and it doesn't provide a huge advantage over phalanx. Combat I phalanx will still have almost 50% odds, not including defensive bonuses... which mounted units do not get. EDIT: Also, in a typical game, I'd have phalanx available long before you had access to horse archers.