The Cross-Time Engineer (Adventures of Conrad Stargard, volume 1)
by Leo Frankowski

A Polish engineer is transported into the past, ten years before the
first Mongol invasion of Poland. Luckily for him, his allies include
the book's author.

https://jamesdavisnicoll.com/review/because-i-was-paid
--
My reviews can be found at http://jamesdavisnicoll.com/
My tor pieces at https://www.tor.com/author/james-davis-nicoll/
My Dreamwidth at https://james-davis-nicoll.dreamwidth.org/
My patreon is at https://www.patreon.com/jamesdnicoll

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)