The Admiralty account changes category with the research question. It is secondary for American and Japanese actions, but primary for what British officials understood and learned. Its account covers duplicated reconnaissance sightings, Nagumo's warning that four American carriers remained undamaged, and Yamamoto's mistaken belief that the enemy fleet was nearly destroyed. The operational narrative demonstrates how source criticism works in practice.
Chapter · 1:44:17-1:47:53
A British Midway account changes source type with the question
An official Admiralty account of Midway demonstrates why a document can be secondary evidence for a battle but primary evidence for British wartime learning.