1941 and shows a 'dead sea' of wrecked German plane wings and fuselages based on sketches, and photographs, made at the Metal and Produce Recovery Unit at Cowley near Oxford in 1940. The painting recalls a series of bleak sea and coastal paintings Nash made in the 1930s. Although the aircraft dump at Cowley contained many British planes, Nash only depicted German aircraft because he wished to show the fate of the 'hundreds and hundreds of flying creatures which invaded these shores'. He used the German title for the picture as he wanted it included in a series of postcards of crashed German planes he suggested be dropped over the Reich as propaganda. To this end Nash even created a postcard of the painting with Hitler's head superimposed on the wrecked aircraft. Kenneth Clark stated that Totes Meer was 'the best war picture so far I think' and is still considered among the most celebrated British paintings of World War II. Battle of Britain (1941) is an imaginative representation of an aerial battle in progress over a wide landscape of land and sea, suggesting the Thames Estuary and the English Channel. The white vapour trails of the Allied aircraft form patterns resembling buds and petals and appear to be growing naturally from the land and clouds, in contrast to the rigid, formal ranks of the attacking forces. Clark recognised the allegorical nature of the work and wrote to Nash, "I think in this and Totes Meer you have discovered a new form of allegorical painting. It is impossible to paint great events without allegory... and you have discovered a way of making the symbols out of the events themselves." After completing Battle of Britain, Nash found himself creatively blocked and again sick with asthma. Whilst unable to paint he did produce a number of photographic collages which included symbols and motifs from previous works often alongside images of Hitler. Nash submitted a series of these pieces, entitled Follow the Fuehrer, to the Ministry of Information for use as propaganda but they declined to use them. When he did resume painting, Nash produced Defence of Albion, which is considered the weakest of his four large WAAC paintings. Nash had great difficulties completing the painting which shows a Short Sunderland flying boat in the sea off Portland Bill. As he had only seen photographs of Sunderlands, and was too ill to go