Étaples seemed to be a shining example of mass revolt.
Orthodox military historians tend to disagree. By and large the morale of the British Army stood up to four years of punishing war better than that of other nations. The British was the only major Army not to suffer from widespread mutiny. The Étaples mutiny was small-scale, highly localised, and a (largely justified) response to bad management on the part of the officers in charge of the camp. John Keegan has written:

The Étaples 'mutinies' amounted to no more than a few days of disorder, a little disrespect to officers and some loudly-voiced demands for human treatment. The army reacted briskly. It restored discipline by bringing in unaffected troops. It removed the cause of discontent by replacing the worst of the staff with wise men. That is about all there was to the British Army 'mutinies' of the 1914 – 1918 war."
https://greatwarfiction.wordpress.com/2011/11/04/2670/