Once you get the time of soldiers reform you will be able to recruit Kluddargos and Rycalwre, two of the best infantry units in game and both uber-elites. Also, you can recruit ships at Ictis, the town directly to the west of Camulosadae/London. Typically it makes a good first target for this very reason. Also, Casse doesn't get hard until you start facing Roman fullstacks, Lusitanian fullstacks, and Sweboz fullstacks at the same time in Gaul. Very possible and very annoying.