There are 12 books in the Legacy of the Aldenata series. The newest book is The Tuloriad which came out in 2009.

1
A Hymn Before Battle

Book cover of A Hymn Before Battle
WITH FRIENDS LIKE THESE . . .
With the Earth in the path of the rapacious Posleen, the peaceful and friendly races of the Galactic Federation offer
their resources to help the backward Terrans-for a price.
Humanity now has three w
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5
The Hero

By John Ringo , Michael Z. Williamson,

Book cover of The Hero
The human was an expert sniper-and a psychopath. He had never failed in the past when he stalked human prey. But now he is on an enemy planet, and his prey is anything but human. The Darhel are a race with a highly developed empathic sense. Long ago, they learned…

9
Sister Time

By John Ringo , Julie Cochrane,

Book cover of Sister Time
Cally O'Neal is officially dead. In her over forty years of being an active
secret agent she hasn't used her real name, much less spoken to her sister. So
when Michelle interrupts an important mission, by seemingly appearing out of
thin air, it's an

11
Eye of the Storm

Book cover of Eye of the Storm
The return of Mike O'Neal and the New York Times Best-Selling Posleen War series. The sequel to When the Devil Dances and Hell's Faire.