Marco Polo Bridge incident

Battle context

The Marco Polo Bridge incident initiated open warfare between China and Japan, marking the start of the Second Sino-Japanese War. The confrontation pitted the Chinese 29th Army of the National Revolutionary Army against the Imperial Japanese Army over three days in the district of Beijing. Though limited in initial scale, the engagement set in motion a prolonged conflict lasting until 1945 and drew in an extensive command structure on both sides, reflecting the strategic weight both nations attached to the outcome. The incident transformed a localized military confrontation into a full-scale war that would define the political and military trajectory of East Asia throughout the late 1930s and 1940s.