The line from the poem here that tells us what the hyperbole is louder than cannon fire.
This is the term that is used to refer to the statements that are often made as an exaggeration. These are the types if sentences that one does not have to take based on its literary meaning.
It is a literary device as a well as a figure of speech that is used in English language. The speaker uses the literary device to create strong feelings in the person that is being spoken to. Hence they are not to be taken on its literary meaning. They should be understood as the exaggerations that they are.
The exaggeration here is comparing an applause to cannon fire. Of course the writer is telling us that the applause was great, but we have to understand that there would no way that human clapping would be as loud as Cannon fire.
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