This lecture discusses the critical events leading up to the Chinese Civil War, highlighting the interactions between key figures such as Mao Zedong and Zhang Xueliang. It begins with the inevitability of civil war and details the diplomatic efforts made by Patrick Hurley, the US ambassador to China, who encouraged Mao to engage in talks with Zhang in Chongqing. The historical context is provided, noting that the two leaders had not met in nearly two decades, dating back to their association with Sun Yat-sen in Canton. During their meeting, Zhang referred to Mao as 'elder brother,' and Mao raised a toast to Chiang Kai-shek, indicating the complex relationships at play. Despite these efforts, the talks ultimately failed to yield any substantial agreement. The lecture also covers President Truman's continued attempts to mediate the conflict by sending General George Marshall, which resulted in a signed agreement that quickly fell apart, illustrating the challenges of achieving peace during this tumultuous period.