Brilliantly made game with many different ways to win and lose. Here are a few pointers to people who might need it:
Morale is gained by gaining more land, capturing a towm/port, capturing a capital, and killing enemies. Morale is lost by losing land/towns/ports and combining several smaller platoons into one large platoon.
Keep both Morale and Units in decent quantities, otherwise the enemy will practically curb stomp you into the ground.
It's best to start in a location with at least 3 towns you can capture within 1-2 turns. That way, you have a steady supply of units in the first part of the game.
The tactic i always use is:
1) Destroying the enemy directly above/below me,
2) signing a peace treaty with the stronger-looking of the two remaining enemies (If you have lots of land and units, more than half the time the enemy will accept),
3) strengthen my units and create many 99/?? units while letting the remaining two enemies wear each other out (The temporary ally will not cross into your land, nor will he steal territory, until either he dies or he kills the last enemy), and
4) curb stomp the crap out of the ex-ally before he can build up a decent army
Chances are things won't go exactly like that, but it works at least 80% of the time for me. Hope it helps~