Because the plan was to have Jasper (who was unknown in Westmist) to present himself and the barbarians as mercenaries for hire to Lord Merdwyn. Having ingratiated himself into Lord Merdwyn's good side, the party and their supporters could strike by surprise and take out Jax and the March Baron. The Stonehell Resistance, Sir Janu,s and Duncal were left behind to await developments. Jasper collected a dozen of the biggest and meanest looking barbarians, and with the party invisibly in tow, headed to Westmist. On arrival, it would appear they had been expected, for all the gates were barred and patrols mounted the walls. Hollering out to the guards, Jasper asked that Lord Merdwyn came out to parlay. It took some time, but soon the March Baron (accompanied by Jax, Bazzrel, Liphanes and a gaggle of guards) appeared on the wall. He was immediately hostile, letting Jasper know he was aware of his connection with the party, as well as this act of invasion they've performed by bringing a barbarian tribe across the Great River. This was just the type of incursion the March Baron was supposed to guard the Kingdom against, and he had no intention of parlay. Riders had already gone east to inform the king and summon the royal companies to his aid. Lord Merdwyn suggested Jasper take the tribe and the rest of the party and clear out before the hammer fell. And with that, he turned his back and left the wall.