Masters of Time (aka Earth's Last Fortress)
Masters of Time - aka Earth's Last Fortress Author:A. E. Van Vogt A recruiting station; a storefront in the heart of a big-city downtown. Young men can volunteer to join the armies of a beleaguered new democracy overseas. But the recruitment is a scam. Each volunteer goes, not to the Calonian army, but through a pulsing machine which moves them hundreds of centuries up the time line, to become cann... more »on fodder in a war which is shaking the universe. Two present-day humans are taking on this mammoth military machine. Their chances are miniscule. Their only hope is to save a few lives before giving up their own. But playing tricks with Time can lead to unexpected results.
~Original title, in magazine serial, was "Recruiting Station." Also published by Ace Books as "Earth's Last Fortress." ~« less