If you keep failing to defeat early raiders, the try
and keep your town garrisoned, for a greater success.
Checking your Diplomatic Relations Chart, on regular
occasions, will help you knwo where your battling
empires are, and enable you not to get involved in ana
alliance that will se you get several automatic enemies.
Only build military units to a size your economy can
handle, unless you mass them for a quick strike against
some wealthy opponent.