Ambassador 12: The Unfolding Army:

For three months, Cory and his team have hung with Asto's military in orbit, watching as drone armies attacked Earth. They could have helped more had Nations of Earth communicated with the fleet or if they could only find out where these drones come from, who controls them and from where. The enemy is smart, enmeshed with sections of Earth's population and Asto's military severely hamstrung by Nations of Earth playing chicken. Three months ago, the president contacted Cory asking for help. ...