One tactic is to build about four cities, then build barracks in each one using tree chops to rush them- build an army of ten archers - attack! ; and try to wipe out your closest neighbor or neighbors early in the game. The technique is to simply build only archers instead of cities ( use the archers to take the enemy cities) so you effectively build your military strength and the size of your empire at the same time using the same shields .
If you play a civ like the Iroquois with a strong early unit, you can win the game pretty qu ickly, never building anything at all but attackers and barracks. No spears, no libraries , markets or temples, just attackers.
You simply move your stack of ten or so units from town to the next closest town , only stopping to heal or await replacements.