How many reinforcements do I get per turn?
At the beginning of the game, you get to place one reinforcement at the
start of each turn.
Once you have two separate castles, you can place 2 reinforcements per
turn, three for three castles, etc.
A castle of size 3 or more adds an extra recruited soldier per turn. So if
you have 2 castles, but one has 3 castle cards connected, then you would
get 3 recruits, not 2.
If an invading army destroys all of your castles and invades your
homeland, you get no reinforcements unless you build a new castle, in
which case you can recruit into that castle only (only one castle can be
built in this way, so only one recruit per turn until they're kicked out and
you get building again).