and fully upgraded reinforcements. The throwing spears are so good!
^^ This.
I found that at first, the reinforcement upgrades didn't do much, but once you get the throwing spears, it helps a lot.
I just build a barracks or two, find a decent rally point and surround them with towers, each one will have atleast a Marksmen, Mage and Artillery tower supporting them.
Once you unlock barbarians and sorcerer towers, the game becomes so much easier. Just upgrade to Warriors to Barbarians, buy throwing axe and hunting nets upgrades, upgrade Mages to Sorcerers, and buy both upgrades for those, is what I do.
For archers, half my towers will be muskets, and half Rangers.
I don't use artillery asmuch, and if I do I never feel the need to upgrade them very much, but if I do, I'll upgrade to big Bertha, and buy all upgrades for that. (:
I made a walkthrough, but I deleted the videos and started again.
Check them out here:
http://www.youtube.com/watch?v=KVzMgJjgm5c