Preparing The Ground - Preparations for War, #1

It started innocently enough. Joe was the engineer on one of Earth's first explorations beyond the Solar System, using borrowed Imperial technology. Captured on a hostile planet, he has to make a plan for his crew to escape - and then he discovers his real mistake! He becomes a Missionary of Civilization on a primitive planet caught between massive empires - and the enemy has to think it's all native ingenuity!