Which episode is the investigation of the spy in Changsha Defence War?

Finding the mole in Changsha Defence War is episode 24:

The Battle of Changsha is a historical war drama jointly produced by CCTV, Hunan Heguang Media Co., Ltd. and Zhejiang Meinong Film and Television Co., Ltd., directed by Yachun Dong and starring ZhangFeng yi, Tong Ruixin, Dai Jiaoqian, etc.

The play tells the story of four large-scale offensive and defensive wars between China army and Japanese invaders in Changsha.

1After giving up Wuhan in June, 938, China entered the stalemate stage of the Anti-Japanese War, but the Wenxi fire destroyed Changsha, which was about to become the front line of the Anti-Japanese War. Xue Yue, the iron-blooded general, was appointed as the acting commander of the ninth theater. His former rival Peng Zhonghua, who was in Xiangtong, was ordered to come to the door to offer suggestions and take on the important task of defending the country and defending the country with Xue Yue.

After a bitter battle, Xue Yue finally, with the close cooperation and support of China * * * Production Party and Hunan people, commanded Sanxiang samurai soldiers to retreat from Okamura Ningji and Annawiki, and attacked Changsha for three times.

And a little guy like Li Benzhong, a policeman, involuntarily joined the torrent of War of Resistance against Japanese Aggression, and gradually grew into an iron warrior with both wisdom and courage in the baptism of hard fighting.

At the end of the third Changsha Battle, there was still a long way to go in the War of Resistance, but the people of China have proved the conclusion of protracted war with hard facts. If they persist in the war of resistance and the United front, the final victory will surely belong to China.