The time has finally come to address the claim I've made in the title of this series of posts, that the air raid somehow vanished. Why did I say that, and what does it mean? Well, look at the plot above. Previously I looked at how often 'air raid' (and related phrases) appeared per issue in the British Newspaper Archive (BNA) in each month across the First World War. The above plot, now, is how often 'air raid' appeared per issue in each year from the start of the First World War (when 'air raid' was first used) until the end of the Second. Now you can see that the first peak in 'air raid''s popularity came in 1917, at an average of 0.8 mentions in every newspaper issue in BNA; and that this was followed by a second, much bigger peak in 1940 of 5.2 mentions in every newspaper issue in BNA. All of which makes sense.
What's more surprising is what happened in between. From 1921 to 1934, the phrase 'air raid' almost completely disappears from BNA. At the lowest point, 1929, the average number of mentions per issue was just 0.026, or one in about 38. In other words, if you read 38 issues you might expect to read the phrase 'air raid' once, which is more than six weeks of reading a daily. If you want some absolute figures, 'air raid' appears 609 times in the 23054 issues contained in BNA for 1929. So 'air raid' was not a phrase you were at all likely to see in a newspaper in the 1920s and early 1930s.
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