Mao Ying-Chu was a native of Fenghua County in Chekiang.
His older brother Major General Mao Pang-Chu (also known as P. T. Mow and Peter Mow) was Combat Commander of the Chinese Air Force during the war.

Mao Ying-Chu served as the commander of 23rd PS in the 4th PG when the Sino-Japanese war started. This unit was at the time equipped with Curtiss Hawk IIIs.

Mao missed the big battle on 14 August 1937 after that Colonel Kao Chi-Hang commanded him out of the aircraft he just landed.

During the night of 14 and 15 August the pilots of the 4th PG at Schien-Chiao airbase had to prepare their fighters themselves since the ground personnel had left the field to take shelter during the air raid on 14 August and had not returned. The pilots carried cans of fuel on their backs from the storage building to the field, punched holes on the cans and fuelled the aircraft themselves. They had not eaten since noon, and were not able to go to bed until 1:30 a.m. They did not sleep long because alarm sounded less than two hours later.
In the early morning on 15 August Colonel Kao Chi-Hang led 21 Hawk III's from the 4th PG to intercept a dawn attack on Hangchow by twelve Type 89 torpedo bombers from the Japanese carrier Kaga. In the confused action in and out of clouds, the 4th PG made 17 claims, more than the total number of Japanese planes in the action. The actual losses were six shot down and two ditched in Hangchow Bay.
Kao quickly shot down one of the Type 89's on the edge of the formation and then attacked another setting it alight. A lucky shot from the starboard quarter hit Kao in the right arm before passing through the instrument panel and damaging the engine in his Hawk No. IV-1. He was forced to land at Schien-Chiao and was out of action for 2 months.
21st PS's Squadron Leader Captain Lee Kuei-Tan in No. 2101 attacked the No. 2 Shotai, shooting down the No. 2 plane over Chao-Er. Two out of the crew of three were seen to bail out but they were over the Chao-er River and probably did not survive. Lee then teamed up with Lieutenant Cheng Hsiao-Yu of 22nd PS in No. 2202 to claim another Type 89. Return fire from the tightly packed Japanese formation was heavy and Lee's No. 2101 received slight damage to its upper wings while Cheng’s No. 2202 took a shot in one of its landing wheels. Cheng’s wingman, 2nd Lieutenant Chang Kuang-Ming also claimed a victory in this combat when he attacked the leader of a group of Japanese bombers. He opened fire with his two machine guns. Tracers and bullets truck his target, and the enemy plane turned into a fireball and plunged out of the sky. He broke off immediately and turned around for another strike.
Lieutenant Huang Yan-Po in No. 2107 attacked the first Shotai, claiming to have shot down the No. 3 aircraft in flames. He too took a shot in the landing wheel. Lieutenant Tan Won in No. 2104 also attacked the same Shotai and claimed another Type 89. This may have been the aircraft of the Kaga's Commander, Air Group (CAG) Commander Iwai who was killed in this action along with his deputy. Lieutenant Wang Wen-Hua caught two Type 89's trying to attack Schien-chiao from the south and shot one down in flames. One of the crew, a young ensign, bailed out and was captured. (This unnamed ensign later defected to the Chinese side and helped translate decoded Japanese radio messages). Lieutenant Yuan Chin-Han in No. 2108 went after the No.1 Shotai in a formation and claimed to have shot down the leader in flames (this may also have been Iwai's plane, it is almost certain that many Chinese pilots shot at the same planes). Lieutenant Liu Chi-Sheng in No. 2102 also claimed one Type 89 over Woong-Chia-Fu but was hit in the fuel tank and force landed at Chaio-shi Airfield where his plane was further damaged by bombing.
Lieutenant Le Yi-Chin from the 22nd PS made no less than 4 claims but these are almost certainly duplicates of other claims or overoptimistic.
Deputy Squadron C.O. Lai Ming-Tang landed to refuel and took off again to claim a shared kill with his wingman Lieutenant Liang Tian-Cheng.
Of the 23rd PS, Captain Mao Ying-Chu, Lieutenant Yang Yu-Ching and Lieutenant Wang Yin-Hua each claimed one Type 89.

The first combat with the new A5Ms was reported on 7 September when a pair of A5Ms led by Lieutenant Tadashi Nakajima from the aircraft carrier Kaga met nine Chinese Hawk IIIs under the command of Captain Mao Ying-Chu of the 23rd PS, 4th PG, over Lake Taihu. Lieutenant Cheng Hsiao-Yu’s aircraft (Hawk III no. 2209) was damaged when he made a forced landing at Yang-Lin Kou.
The returning Japanese pilots claimed three Chinese fighters and returned to the Kaga undamaged.

On 19 September 12 A5Ms led by Lieutenant Shichitaro Yamashita of the 13th Kokutai participated in the first air attack on Nanking as escort for the 17 carrier bombers commanded by Lieutenant Commander Tetsujiro Wada. Three fighters from Kaga under the command of Lieutenant Chikamasa Igarashi were also added to the main force and 16 reconnaissance seaplanes also took part in this attack. Engaging in air battle with some reported twenty Curtiss Hawks and Boeing 281s that had risen to intercept them, twelve enemy aircraft and three probables were claimed shot down by the fighters. Totally it seems that the Japanese claimed 33 victories and 6 probables in this combat. Kiyoto Koga of the 13th Kokutai, who participated in his first combat, returned claiming two Curtiss Hawks shot down while shotai leader PO1c Tadashi Torakuma of the 13th Kokutai (also in his first combat) claimed two enemy aircraft. Toshiyuki Sueda of the same unit in his first combat claimed two enemy aircraft (of a total of 9 – 6 in China). One victory was also claimed by Osamu Kudo of the 13th Kokutai over Nanking but his aircraft was hit and he was forced to ditch in the Yangtze River but he was rescued. Juzo Okamoto of the 13th Kokutai claimed his first victory (of a total of 9 – 3 in China) while flying as the number three wingman to Lieutenant Shichiro Yamashita. Of the three fighters from Kaga both Lieutenant Igarashi’s and the number two wingman’s aircraft developed malfunctions and returned but over Nanking PO2c Ki-ichi Oda, who had carried on, claimed two and one probable Curtiss Hawk. Three Japanese carrier bombers and one seaplane were lost.
It seems that they were intercepted by 23 Chinese aircraft; eight Hawk IIIs of the 4th PG, eight Hawk IIIs from the 5th PG and five Boeing 281s and two CR.32s from the 3rd PG. It seems that eleven Chinese aircraft were lost for only one claimed, this one being made by Lieutenant Chen Huai-Min of the 23rd PS, 4th PG (Hawk IIIs), which claimed one Japanese aircraft shot down. Four Chinese pilots were lost in this combat. They were Dai Guang-Jin (Hawk III no.2509), Liu Lin-Qing (Boeing281), Huang Ju-Gu and Liu Chi-Hung, flight leader of the 8th PS (CR.32). Four more Chinese pilots were wounded including flight leader Liu Chung-Wu of the 25th PS (Hawk III no.2101), which was hit in the left leg and returned to Ju-Rong airfield near Nanking. Wu Ting-Chun’s (Hawk III no.2102) leg was also hit by bullets and he made a force landing at Yang-Zhou airfield. Liu Yi-Jun was injured and baled out of Hawk III no.2512 and the same fate fell to Yang Ji-En, which also was wounded and baled out of Hawk III no.2306. Four more Hawk IIIs returned damaged; “IV-1” flown by Captain Mao Ying-Chu, no. 2404 flown by vice-commander Teng Ming-Teh of the 25th PS, one aircraft flown by Chou Geng-Hsu of the 25th PS and no.2405 flown by Chen Huai-Min of the 23rd PS. Two Boeing 281s were also lost in this combat.

Mao commanded the 4th Group in the big battle over Wuhan on 29 April 1938.

Later in the war he flew Polikarpov I-152s and was credited to claim three Japanese bombers while flying this type.

Mao Ying-Chu ended the war with at least 4 biplane victories and a total of 5.

Mao graduated from the U.S. Staff and Command College in 1946.
He rose to Lieutenant General in the Chinese Air Force in Taiwan, and then served as Director of the Civil Aviation Bureau in the 1960’s.

Claims:

Kill no.	Date	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1937
1	15/08/37	1	Type 89 (a)	Destroyed	Curtiss Hawk III		Hangchow area	23rd PS
2		1	Enemy bomber	Destroyed	I-15bis
3		1	Enemy bomber	Destroyed	I-15bis
4		1	Enemy bomber	Destroyed	I-15bis

Biplane victories: at least 4 destroyed.
TOTAL: 5 destroyed.
(a) Claimed in combat with Type 89 torpedo bombers from the Japanese carrier Kaga. The Chinese pilots claimed 17 destroyed enemy aircraft but the actual losses were six shot down and two ditched in Hangchow Bay.

Sources:
Japanese Naval Aces and Fighter Units in World War II - Ikuhiko Hata and Yasuho Izawa, translated by Don Cyril Gorham, 1989 United States Naval Institute, Annapolis, ISBN 0-87021-315-6
Tidbits from the Sino-Japanese Air Battles - Chang Kuang-Ming, 1998 World News Weekly August 1998 kindly provided by Tom Chan
Information kindly provided by Raymond Cheung, Tom Chan and Erich Wang.