Evans was recruited into the Intelligence Corps at the start of WWI, as he had just finished a year in Germany and was fluent in the language. He moved to the RFC as an observer in 20 May 1915 and soon made Captain as a Flight Leader. He became a pilot and continued his excellence in observing and reporting. In 1916 his aircraft had engine trouble while behind the German lines and he and his observer were captured. After many unsuccessful escape attempts he escaped to Switzerland after walking for eighteen nights. He was made a temporary Major and CO of 142 Sqn in Palestine and Mesopotamia, where he flew successfully until captured again in 1918

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