The year is 1237. Blood-spraying Rus before the invasion of the ORDA… and our transmigrated man in the body of a dying Smolensk prince. There are four years left until the invasion of the Tatar-Mongol horde onto Rus, torn apart by princely feuds in which the prince’s father, the Prince of Smolensk, is actively involved. Will the prince manage to prepare his armored infantry and arm his force with new weapons? After all, he knows extremely well the processes of casting iron and steel—and chemistry is his forte!