Hive Invasion3 books in series
Starship Alexander Publisher's Summary
A washed-up captain. A worn-out ship. A crew of green cadets. And they're Earth's only hope.
The Alexander is the last true warship, a relic from the days of interstellar war. She's destined for the scrapyard, and her captain, Richard Hammett, is about to retire. Their last mission is a training run with a ship full of cadets.
It's supposed to be a routine hop through a wormhole gate. But gates have been going offline, one after another, and Hammett knows in his bones it means trouble. The kind of trouble only a real warship can handle.
Defying orders, he takes the Alexander through another gate, and puts the ship smack dab in the path of an alien invasion. Now a captain at the end of his career will have to take dozens of terrified cadets and forge them into a crew of warriors, because the Alexander is all that stands between the Earth and the swarming ships of the Hive.