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Ludendorff proposed to attack the massive fort complexes of Verdun and Toul-Nancy in addition to the assault on Belgium, which had been the doctrinaire orthodoxy of the Schlieffen Plan for about 15 years.
The failure of the Schlieffen Plan offensive in 1914 is attributed in part to French air superiority blinding German reconnaissance, but the German victory at Tannenberg is thought to have been helped by prompt response to air intelligence about Russian movements.
Among superguns, the Paris Gun only fired on civilian targets, while Big Bertha was, though famous for shelling Paris from over 40 kilometers away, primarily responsible for smashing the Belgian forts near Liege during World War I in 1914 as part of the Schlieffen Plan.