Margaret Donaldson has written several children’s novels, amongst which is Journey into War, set during the Second World War.
Finding the book</b
Reasonably easy to find.
Bibliography: pony books only
Journey Into War, Deutsch, London, 1979, illus Joanna Stubbs, 152 pp.
Hippo Books, 1999, pb, illus Joanna Stubbs, 187pp.