Rules for Reinforcement

So - I forgot the reinforcement rules after my first night of play and there doesn't appear to a manual or any way I can get that information again in the game.

1. Are these rules documented anywhere in the game?
2. What are the rules for reinforcement? Do I need a general? What is the best, medium and worst case scenarios for reinforcement?

Without a general, in a friendly settlement (capital or town).

With a general, in friendly territory.

Impossible in foreign territory.

Hmm? Has reinforcement been changed from the way they work in ETW?

No button. It has to be done gradually. You can make it faster by building supply depots; that makes armies reinforce faster in that region. You cannot reinforce in foreign territory at all.

Ah, I thought we're talking about reinforcements in battles.

So what about battle reinforcements? Any changes in that area?