The rage of feeling hard done by, is how I read this.  I like ‘disguise fair nature with…’, meaning you have to overcome your happy nature to drum up some fake fury.   That final ‘etc’ gives it away as a feint.

‘But when the blast of war blew in their ears, they imitated the action of the tiger, stiffened the sinews, summoned up the blood, and disguised fair nature with hard-favoured rage, etc.’

 

Source: Patrick Leigh Fermor, A Time of Gifts (London: Penguin Books, 1977), p. 129

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