1938 Horrors Of War #155, Cantonese Parade Through Coffin-Lined Streets 💥
The 1938 bubble gum card set, produced by Gum, Inc., was designed to "teach peace by exposing the horrors of war" and featured the tagline: "To know the HORRORS OF WAR is to want PEACE". 
President Roosevelt found the initial 240-card series helpful in illustrating the atrocities occurring in the Spanish Civil War, the Ethiopian War, and the Chinese-Japanese War to the American public.
FDR didn't officially endorse the cards, but used of them to promote U.S. public awareness of international dangers. This prompted some U.S. senators to criticize him for engaging in "bubble gum diplomacy".

1938 Horrors of War #1, Marco Polo Bridge 💥
The 1938 Horrors of War card set is significant because it documented real-world conflict and horrors associated with armed conflict at a time when global tensions were rising.
The artwork is graphic and the narratives on the backs were stark; making it one of the most influential and socially conscious non-sport sets ever produced.
This is Card #1 and historically important because it depicts the incident that ignited the Second Sino-Japanese War and foreshadowed the broader conflicts that would culminate in World War II. Its placement as the first card underscores the set’s intent to confront collectors immediately with the grave impact of global events.

1938 Horrors of War #1 Marco Polo Bridge
This is the first card of a very interesting set. Enjoy!