In book one of this series, a unit of the Seventh Cavalry is on a mission over Afghanistan when their plane is hit by something. The soldiers bail out of the crippled plane and come down in Southern France and they’re 2,000 years in the past where Hannibal is taking his elephants over the Alps to attack the Romans. In this second book they must attempt to rescue three astronauts who have come down from the ISS in a Russian Soyuz escape capsule. They are stranded on a mountain above Saravejo, about 800 miles away.