If you like Conrads series, you might like. The Lost Regiment by William R. Forstchen Island In The Sea Of Time by S.M. Stirling Belisarius I by David Drake Warlord (Raj Whitehall) by Stirling and Drake
Manga: Spirit Circle to various place in various time period: Egypt, Europe, aztec... Shuto Heru: backward reincarnate into the timeperiod of Mongol invasion of China, place is the western border of China I think. Novel Ascendance of a Bookworm: reincarnated to a lowmagic pseudo medieval Europe-equivalent. Author seems to research well into the realities of medieval Europe.
My life as military official of the han is repulsive as expected basically hachiman in ancient china, really good