Equestrian stories are full of adventures, adversities, dangers and drama. Yet the curious story of William Holt and his cart horse, Trigger, is one of the most inspiring equestrian travel tales ever told. After rescuing the gelding from slaughter, and then nursing him back to health, the 67-year-old Holt and his horse set out in 1964 on an incredible 9,000 mile, non-stop journey through western Europe. Holt never ranked himself above his mount. The resultant trip saw them sleeping out in the rough without a tent for more than 400 nights. Together they faced great hardships, suffering...