The Future at War Series
Book Series
by Poul Anderson
Latest:
1989
Book 1
Thor's Hammer
by Reginald Bretner
Book 2
The Spear of Mars
by Reginald Bretnor, James Tiptree Jr., Frank Quattrocchi
Book 3
Orion's Sword
by Bretnor, Isaac Asimov, Joe Haldeman