To ride up hill and down dale means to ride all over the area, which is what he did for the last ten hours.
Context: "I've been riding all over the area for the last ten hours, he said, taking the cloth from her and tossing it onto the bed." Claim: "I've been riding up hill and down dale for the last ten hours,he said, taking the cloth from her and tossing it onto the bed."
Considering the context, is the claim true, false, or unknown?