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In page Chill Wills:

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Wills voiced Francis the Talking Mule in a series of 1950s comedy films. His deep, rough voice, with its Western twang, was matched to the personality of the cynical, sardonic mule. As was customary at the time, Wills was given no billing for his vocal work, though he was featured prominently on-screen as blustery General Ben Kaye in the fourth entry, Francis Joins the WACS.[citation needed]