Now I've just cleared the last few things before fighting the English Army.
Mainly it was checking all the main merchants and also completing the Red Crystals.
I'd left the last encounter because the number of enemies. This time I could handle a small army of Lesser Brimstone Reavers though, especially when I ropped a couple of Firepowder Kegs. There must have been around 15 of them and they all died at once (150XP each) and good treasure too.
I found some Bracer that increased the Ranged skill by 39 points (though I had just bought some identical bracers
) and some other good stuff there.
So, now I'm clearing Montaillou of invaders.