Rosalind Murray wrote The Happy Tree after the war (it came out in 1926) but it is about the war, and in the same league as books like Dusty Answer and Testament to Youth, written at the same time, which are also about the effect of the war on a generation of young men and women. As ever, it was superbly written about in the Persephone Forum here; and the reviews on Good Reads give an excellent overview of its superb qualities – for anyone wondering whether or not to read The Happy Tree, you should.