During the time Jack spent training while waiting for his army to gather, Jeanny and the others had been hard at work setting up the war tools at the strategic spots John indicated. After finishing the setup, they lay and waited for the enemy to arrive.
When Jeanny and the others were doing that, Master conquered three settlements while making his way deeper into Palgrost. On the day Jack went to Vacharest, the Liguritudum army encountered the first blockade.
The Scorpios attacked first. Their ranges allowed them to hit the front-most enemies when the Cheval de Frise were still very far away.
Surprised by this ambush, the commander of the front line called for a charge, only for the charge to be forcefully stopped by the caltrops. The bolts from the Scorpios never stopped coming at them.