Of course, sometimes historical manga is made to record actual history (or at least a somewhat fictionalized version of it) straight from the source. Shigeru Mizuki made many manga like that over his lifetime, but few were as personal to the man as this.
ONWARD TOWARDS OUR NOBLE DEATHS (Soin Gyokusai Seyo!), by Shigeru Mizuki. First published in 1973 and first published in North America in 2011.
PLOT:
In 1944, a faction of the Imperial Japanese Army is sent to New Britian, a tiny island off the coast of Papua New Guinea. They are meant to repel Allied forces, but instead their days are mostly filled with a regular routine of starvation, tropical disease, and abuse from their superior officers. Eventually, one of the captains insists that the unit perform a suicidal march to the coast to save face, even if doing so comes at the expense of the soldiers themselves.