Cobra Alliance - Zahn, Timothy

When two colony worlds fall to Troft forces almost without a struggle, Earth makes a desperate decision. It would attack the aliens not from space, but with a new Cobra ground force. Now that same force is under threat of disbanding--just when they're needed most.

Cobra Alliance 2010, Baen Books

ISBN-13: 9781439134047

Mass-market paperback

Cobra Alliance 2009, Baen Books

ISBN-13: 9781439133064