Crisis in the motherland leads to freedom for its colonies.

Pretend times change.
In fact change nothing.

Occupied land is a good servant.
Never let it slip off your hand.

Strong united countries are always a threat.

Split and devide.
Let your enemy bash himself in, or at least weaken his military power by splitting his land into pieces.

If you can't win the war conventionally, murder the head commander of your opponent fraction.

Report the death of a leader and you have a chance of demoralizing his troops.