Help Theoden, Eowyn, and Háma gather supplies from a barn and flee to Helm's Deep. The warg rider is waiting to ambush them.
Gather suplies from a barn in the Westfold. Gather a barrel of apples, carrots, and some blankets for the refuges.
Fight from horse back or use the horse to haul supplies.
Theoden, Eowyn, and Háma can even fight in the barn.
Time to head to Helm's Deep*.
* Helm's Deep sold separately.