Coalition chucked 6 armies at greys, lost 06/08 to 17/08 6 battles and 11,300 or so troops. Plus a couple of others versus Kapis which I think coalition won but with few survivors, could be wrong on that but cant be arsed to look up.
To a clan of their size with virtually unlimited cash and masses of troops that is not alot, look at their garrisons. Certainly not guaranteeing a peace. The Wolves a much smaller clan moved many more than that in the intial merc attack. The greys moved masses more than that shortly after.
We were expecting 40,000+ co-alition to plough north, some to be halted by Kapis but those field armies to fall and then to be last ditch defending vs mercs and coalition. Reasons we were prepared to get wiped to hit the mercs have been endlessly discussed elsewhere. 10-15,000 troops mobilised was a joke, the mercs did not get the backing we were expecting. Shame - woulda been good fun.