Question: Which event took place first, Operation Undertone or the Battle of Leyte?
Sentence (from "Battle of Leyte"): The Battle of Leyte in the Pacific campaign of World War II was the amphibious invasion of the Gulf of Leyte in the Philippines by American forces and Filipino guerrillas under the command of General Douglas MacArthur, who fought against the Imperial Japanese Army in the Philippines led by General Tomoyuki Yamashita from 17 October - 26 December 1944.
Relevant evidence: Yes