Steel Gauntlet

Marines ain't supposed to sit. We're supposed to kill."
After the resource-rich planet Diamunde is seized by the armed forces of industrialist Marston St. Cyr, the Confederation Marines face their most desperate battles yet against the mechanized forces of the bloody usurper. Promised a walkover by military planners, instead the Marines must run a gauntlet of steel, with weaponry three hundred years out of date.
For the Confederation's invasion army to seize the planet, the Marine FISTs first have to secure a planethead against St. Cyr's much larger forces which are equipped with superior weapons. Together with their outgunned comrades, the Marines of 34th FIST must do the impossible--or die . . . "From the Paperback edition.