The February 26 Incident

Shigeru Mizuki's manga Showa: A History of Japan 1926-1939 is at once a history of Japan's pre-war military build-up and an account of Mizuki's own childhood during those years. When he focuses on his own childhood neighbourhood he uses the same cartoon versions of his family and schoolmates you saw in NonNonBa. But for historical events he relies on hand-drawn facsimiles of news photographs, some of which you can easily find via Google image search. The ones above relate to the February 26 Incident, a rebellion of part of the Japanese Army in 1936. The cartoons appear on pages 444, 436 and 433 of the manga.