Seconding Shigeru Mizuki. >>473913>>473917
He actually fought in New Guinea, so his "Onwards to Our Noble Death" is semi-biographical.
Do you only want "Horrors of war" kind of thing, or just any historical piece, including ones that are more slice-of-life? If you read romance manga, try Tokyo Lastochika.
This is post-Russo-Japanese War, 1906 to be exact, years before your asked timeframe; but if you want to read a Tarantino-esque fun treasure-hunting adventure, survival, cooking manga, you might check Golden Kamuy.