According to Hanley in The Bubble Gum Card War, Bowman viewed the baseball card market of the mid-1930s as "over-crowded", choosing instead to start with "the G-Men and Heroes of Law Enforcement" (1936) followed by "the Horrors of War" (1938). As you know the 1938 set was very successful, netting Bowman $40K/week at one point. Hanley says: "Flush with the success and profits from his Horrors of War card set, Warren Bowman decided the time was right to re-introduce the baseball card to America".
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