Done like a Frenchman, turn and turn again (1 Henry VI., iii. 4). The French are usually satirised by mediæval English authors as a fickle, wavering nation. Dr. Johnson says he once read a treatise the object of which was to show that a weathercock is a satire on the word Gallus (a Gaul or cock).
They stand erect, they dance whene'er they walk; Monkeys in action, parroquets in talk.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894