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James, in his Military Dictionary, 1816, states:—

“Rats are sometimes used in military operations, particularly for setting fire to magazines of gunpowder. On these occasions, a lighted match is tied to the tail of the animal. Marshal Vauban recommends, therefore, that the walls of powder-magazines should be made very thick, and the passages for light and wind so narrow as not to admit them (the rats).”

The expression to rat is a figurative term applied to those who at the moment of a division desert or abandon any particular party or side of a question. The term itself comes from the well-known circumstance of rats running away from decayed or falling buildings.—Notes and Queries, 2 S., No. 68.