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Walter was among the American expeditionary forces gassed with high explosive projectiles northwest of Toul, on April 3, 1918, in the course of intense shelling that lasted through the night. How much damage he sustained is hard to say. By 1918, after more than three years of chemical warfare, troops were equipped with gas masks with charcoal filters, and there were relatively few casualties. In some accounts, Walter attributed the loss of his lower front teeth to the gassing, which also altered his voice, giving it a wizened, reedy quality that he would exploit so well for comic effect and adapt when he had to play characters older than himself. On This Is Your Life, when Ralph Lindsey mentioned they took “a little shot of mustard gas,” Walter cut him off: “We’re not going to talk about that.” The two men fought together in four major campaigns in 1918: Aisne (May 27–June 16), Champagne-Marne line (July 15–18), Saint-Mihiel (September 12–15), and Meuse-Argonne (September 26–November 11). At Aisne, the Germans bombarded the Allied line with four thousand artillery pieces, and seemed to be winning until the American expeditionary forces arrived and counterattacked.
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Carl Rollyson (A Real American Character: The Life of Walter Brennan (Hollywood Legends))