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Hmm...either something like "Her Majesty's Wizard" by Steven Stasshef or The Belasarius series by Eric Flint and David Weber.
I think you're conflating The Belisarius Series by Eric Flint and David Drake, in which two intelligences from the far future are sent back in time to 7th century Constantinople and wage a war with the 1632 Series by Erik Flint and David Weber, in which a modern West Virginia town is dropped into Germany during the 30 Years War.
Both are excellent series, but with totally different Storylines.
Yours in insanity,
Jervic