I can see a little bit about what inspired the "spark" of his children's books – love, but also a need for escapism, normal but heroic figures in the middle of

I can see a little bit about what inspired the "spark" of his children's books – love, but also a need for escapism, normal but heroic figures in the middle of bewildering and impossible situations, nurturing. It think Danny, Champion of the World, was the first children's book he wrote approximately after this time period?