Question: In which war did Operation Undertone, a large assault by the US and French Armies and the Battle of Mindanao, fought by the US and allied Filipino guerrillas take place?
Sentence (from "Nivelle Offensive"): The main offensive was to be delivered by the French on the Chemin des Dames ridge (the Second Battle of the Aisne, "La bataille du Chemin des Dames" , "Seconde bataille de l'Aisne" and "Doppelschlacht Aisne-Champagne" ), with a subsidiary attack by the Fourth Army (the Third Battle of Champagne, the Battle of the Hills or Battle of the Hills of Champagne).
Relevant evidence: No