You hobble to your feet with the chains. They are extremely heavy, but you manage to waddle forward and to loop the chains around your hands around the driver's head, since he is extremely intent on watching the wagon that just went astray down a different path.
He gasps, drops his reigns, and reaches for his throat. Although you don't feel strong at the moment, your body weight is enough to provide ample force upon the chains. And it doesn't take long before the man falls limply in the driver's seat.
Your antics have been noticed by two cultists on horse back who are riding quickly for the wagon. You fumble clumsily at the dead man's waist and manage to pull the sword out of its sheath. Holding it clasped in the palm of both hands, you stand precariously in the wagon, unable to spread your feet out for better balance.
As the first rider comes up upon you and swings his sword, the only thing you can manage is a parry, but he is not so adept at horseback warfare and rides ahead of the wagon. The second rider has ridden up on the other side of the wagon and can't reach you. However, he is reaching downward, hanging onto the saddle with one hand, and trying to get the danging reigns with the other.
What are you going to do to defend yourself?