Warmachines of Alexandria (Alexandrian Saga #4)

Two hundred years before the Alexandrian revolution, the inventor Archimedes created unimaginable weapons to defend the city-state of Syracuse from Rome. Now, the Alexandrians must contend with an enraged Roman Empire intent on destroying the technologically advanced upstart. While Agog takes his army of steam chariots north, Heron must investigate rumors of ancient weapons thought too destructive for the battlefield. As they speed towards conflict with the undefeated Roman Legion, the Alexandrian side must make a demanding sacrifice to survive.