Lin Yuanshan, a top military expert, accidentally traveled to the Songhu battlefield in 1937 and became a student in the defeated army. In the smoke of gunfire, he discovered that he had a photographic memory and military knowledge that transcended the times - from the drawings of the Type 81 rifle, to the simple formula of the 107 rocket launcher, to the indigenous modification of the "heartless gun"... All the details of the weapons he had participated in or studied were as clear in his mind as yesterday.
