Auferstan: Building A Military in Another World

Hierd awakes in a world he does not know, with a power nigh omnipotent. He can summon things from the era of the 1900s to the 1950s with limitless uses. Taking upon the responsibility of a village, Hierd introduces guns and grenades to the soldiers he himself trains. Everything changes when the neighboring city, noticing the coup, decides to invade them. With Hierd's powers, with his soldiers. And in that future, will he survive with guns, warships, tanks, and planes over the power of swords, shields, magic, and brains?