The type of novel that plays on the reader's fear of attack from a foreign invader is called invasion novel, and it was popular before the First World War.
As its name suggests, invasion novel is a type of literary work in which the story revolves around the invasion of one country by another. Such countries may be real or fictional. This type of novel was most popular from 1871 until the First World War.
With the information above in mind, we can say that the type of novel that plays on the reader's fear of attack from a foreign invader is called invasion novel.
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