These are brief stories of historical fiction by Rosemary Sutcliff in shorter form, most of them originally published as books. The Changeling, The Shifting Sands and The Chief’s Daughter are newly available from SFGateway (as is The Shield Ring).

Stone Age: Shifting Sands (1977)
Bronze Age: The Chief’s Daughter (1967)
Bronze Age: “Flowering Dagger” (1977, in The Real Thing)
Iron Age: The Changeling (1974)
412 BCE: “A Crown of Wild Olive” (1971, originally The Truce of the Games)
60 CE: The Capricorn Bracelet (1973, collection)
80 CE: Eagle’s Egg (1981)
130 CE: “Swallows in the Spring” (1970, in Galaxy)
150 CE: A Circlet of Oak Leaves (1965)
Roman: The Bridge-Builders (1959)
Roman: “The Fugitives” (1964, in Another Six)