The term 'hero city' originated in Soviet publications during World War II, with significant cities like Leningrad, Stalingrad, and Odessa receiving this title for their resilience. The document details the brutal sieges and battles faced by these cities, highlighting the massive human cost and destruction they endured, particularly the extensive suffering in places like Leningrad and the heroic defense of Brest. Key events include the battles of Stalingrad and Kerch, which were pivotal in the Soviet war effort against Nazi Germany.