Even though this story was reprinted as “Stalemate in Time” in the 1960s, it still was just a battle between two death stars. No time travel.
Michael Main
For twenty years, in company with her great father, she had watched The Defender grow from a vast metal skeleton into a planet-sized battle globe.

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(4)

Variants

(2)
  1. “Stalemate in Space” by Charles L. Harness, Planet Stories, Summer 1949.
  2. alternative title.
    “Stalemate in Time” by Charles L. Harness, New Worlds, August 1966.