Question: What German Field Marshall was the uncle of Helmuth von Moltke the Younger, claimed to have ruined the Schlieffen Plan?
Sentence (from "Schlieffen Plan"): German historians claimed that the plan had been ruined by "Generaloberst" (Colonel-General) Helmuth von Moltke the Younger, the Commander-in-Chief of the German army after Schlieffen retired in 1906, who was dismissed after the First Battle of the Marne (5–12 September 1914).
Relevant evidence: Yes