This picture which appears to be pencil and watercolour has the following dialogue:

Said Rud, ‘you call yourself a Fuhrer;
But in my proud opinion you’re a
(To quote my friend Field-Marshal Foch)
Repulsive bloody little Boche.’
I’m not sure if Rudyard Kipling ever met Hitler, however I am sure this is the sort of thing he might have said to him!
(I love the way Sassoon rhymes ‘Fuhrer’ with ‘You’re a’)
Sassoon Sketch

Copyright The Estate of George Sassoon