Well we can hire fresh and train from scratch, If we do this I'd like them to come from the south, Dyvers or Onwall, just so we don't get too much pro Greyhawk sentiment which could lead to a desire for alliance or allegiance in that direction. This is why I tried to recruit other displaced persons from the north rather than Greyhawk citizens in the first wave of recruits.
we can recruit from the peasants but that lessens our agricultural base
or we can hire new fodder for the walls and back-fill the marine positions with hardened troops from the existing units. As we saw with Bob, death comes easy to 0 level guys and on board you are much better off with a well trained unit than a mass of flunkies.. On a wall with lots of missile fire from cover the 0s are much more likely to stay alive and advance.
That we have 4 ships and only 2 crews and 7 marines its certainly time to up the ante. I think we would get volunteers for the marines because they become the richest soldiers (provided they survive) due to getting a share of prize money when a ship is taken. These fellows will likely double or triple their salary by taking part in our recent privateering .