In May 1941 Wu Guo-Duan probably served in the 21st PS of the 4th PG. This unit was at the time equipped with Polikarpov I-153s.
On 21 May there was a duty flight of eight I-153s from the 21st PS and one from the 29th PS at Xigucheng aerodrome commanded by Captain Chen Sheng-Hsing. During the day they scrambled to intercept 27 Japanese bombers over Lanzhou. The Chinese fighters flew in two formations. The first of five fighters was led by Chen Sheng-Hsing while the second of four fighters was led by Chang Kuang-Yun, vice-commander of the 21st PS. The first formation claimed a bomber shot down and it was shared between Wu Guo-Duan, Sun Bo-Xian, Hu Nai-Wu, Zhu Huan and Chen Sheng-Hsing. This was the first Chinese claim with the Polikarpov I-153.
The Japanese bombers were G3Ms from the Mihoro Kokutai. One G3M was lost and another returned after suffering 70 hits.
Wu Guo-Duan ended the war with 1 shared biplane victory.
|Kill no.||Date||Number||Type||Result||Plane type||Serial no.||Locality||Unit|
|21/05/41||1/5||G3M (a)||Shared destroyed||Polikarpov I-153||Lanzhou area||21st PS|
Biplane victories: 1 shared destroyed.
TOTAL: 1 shared destroyed.
(a) Claimed in combat with G3Ms from the Mihoro Kokutai. One G3M was lost and another returned after suffering 70 hits.
Soviet Fighters in the sky of China, Part V - Anatolii Demin, 2001 Aviatsiia Kosmonavtika 1 (translated by George M. Mellinger)
Additional information kindly provided by Raymond Cheung and Erich Wang.