Question: What type of engine was used in the planes used in the raid led by Colonel James “Jimmy” Doolittle?
Sentence (from "Doolittle Raid"): The Doolittle Raid, also known as the Tokyo Raid, on Saturday, April 18, 1942, was an air raid by the United States on the Japanese capital Tokyo and other places on the island of Honshu during World War II, the first air operation to strike the Japanese Home Islands.
Relevant evidence: No