At the beginning of the journey, the Clerics kill all the passengers with something pleasant and painless specifically made for their comfort. Once the caravan reaches the destination, Clerics cast Revivify. Who doesn’t want to return from a year-long trip healthier than when they left?
The secret no bard uttered and no poet told, was this: these warlords and heroes also wanted to settle down, find peace, and scratch their own subsistence existence from the soil with pointy sticks. What good is the story of Harold the Great who defeated the Dwarves at Holden Pass when Harold brutalized his way through the pass just to get the quality soil beyond?