At the start of the Sino-Japanese war, Wang Wen-Hua was serving in the 21st PS of the 4th PG. This unit was at the time equipped with Curtiss Hawk IIIs.

On 14 August 1937 the IJNAF Kanoya Kokutai despatched nine Mitsubishi G3M2 Model 21 long-range bombers under the command of Lieutenant Commander Nitta to attack the Schien-Chiao Airfield near Hangchou and nine under the command of Lieutenant Commander Asano to attack the Kwangteh Airfield. The Japanese planes took off from Matsuyama Airfield in Taipei at 14:50 (local Japanese time), each carrying two 250kg bombs.
The raid was soon spotted by the Chinese and the Chinese intelligence reported that a number of Japanese bombers had taken-off from an airfield Taiwan, crossed the Formosa Strait and were heading north over Chekiang in the direction of Hangchou. At this time Hangchou was only defended by a handful of Hawk IIIs flown by instructors from the Central Chinese Aviation Academy since reinforcements from Chou Chia-Kou hadn't been able to fly in due to bad weather. Colonel Kao Chi-Hang had previously flown from Nanchang to Schien-Chiao to await the 4th PG's Hawk III's which were flying in from Chou Chia-Kou in the Honan Province and which was under his command. The three squadrons of the 4th PG encountered heavy weather en route, with heavy rain and low visibility.
However barely had the warning been received when a number of Hawk IIIs from the 21st and 23rd Squadrons of the 4th PG landed. The newly arrived fighters were hurriedly re-fuelled but this was far from complete when the air alarm started due to the arrival of Lieutenant Commander Nitta's bombers. Colonel Kao rushed to his aircraft No. IV-1, which had just been landed by Captain Mao Ying-Chu. Ordering Mao to go get another aircraft, Kao jumped into IV-1 and, without waiting to be refuelled, took off immediately. He joined up with Lieutenant Tan Won who had just spotted Nitta's flight (No.1 Shotai) of 3 G3M's.
The Japanese came in at the low "attack" altitude of 500m, which made it easier for the Chinese to intercept them right after the take-off. The Japanese dropped their bombs on the airfield doing little damage. Tan opened fire on the No.3 G3M in Nitta's Shotai. However, the much more experienced Kao noted that Tan had opened fire from out of effective range. Kao then bore in himself and closed in also on the No.3 Japanese aircraft. He first silenced the two Japanese gunners and then closed in to 20m(!) firing steadily at the left engine. The wing tanks on the left wing caught fire and the G3M crashed burning near the town of Banshan near the airfield.
Kao then spotted the No. 3 Shotai and attacked the No. 2 aircraft. Again, Kao bore in to close range riddling the G3M with 70 hits and crippling the left engine. Kao then ran out of fuel and had to make a dead stick landing at Schien-Chiao. The Japanese G3M managed to limp back to Matsuyama on one engine. But as it touched down, the left landing gear collapsed and the aircraft suffered "moderate damage". The Japanese later took this plane out of service to be displayed in Japan and, to all intents and purposes, it was written off.
While Kao was attacking the No.2 plane in No. 3 Shotai, 21st PS Squadron Leader Captain Lee Kuei-Tan and his wingmen Lieutenant Wang Wen-Hua and Lieutenant Liu Chi-Sheng caught up with the No. 3 plane of the Shotai. Shooting at the hapless G3M repeatedly, the three brought it down near Banshan.
The two flights led by Lieutenant Commander Asano ran into a single Hawk III flown by Captain Chow Ting-Fong (Squadron Leader of the 34th Provisional Pursuit Squadron made up of cadets flying Hawk II's). Chow was a flight instructor from the Air Force Academy and his guns were empty from an earlier action over Shanghai. He, nevertheless, dived into the attack, putting the Japanese off their aim as they dropped their bombs on Kwangteh.
When the 22nd PS reached Schien-Chiao, the Japanese bombers had already dropped their bombs. They took off trying to catch the Japanese bombers that were flying east. They flew to the mouth of the Chien Tang Chiang (river) amid low cloud and bad weather where they lost sight of the Japanese aircraft and returned to base. Pilots included in this chase were flight leader Lieutenant Le Yi-Chin and 2nd Lieutenant Chang Kuang-Ming. However, Lieutenant Cheng Hsiao-Yu of the 22nd PS managed to intercepted them. Cheng had taken off too late to intercept Nitta's flights and flew on to Chien Tang Chiang on a hunch. Spotting the G3M's, Cheng gave chase and caught up with No. 2 aircraft of the No. 2 Shotai over Chao-Er. Cheng shot up the right engine and the wing tanks of this G3M and sent him away streaming fuel. This G3M eventually ran out of fuel just short of the Taiwan coast and ditched just off the lighthouse at the mouth of Keelung Harbour.
The Chinese lost one Hawk III which ran out of fuel when it tried to take off as Nitta's G3M's arrived overhead. This unfortunate Hawk No. 2105 crashed into a tree, mortally injuring its pilot Lieutenant Liu Shu-Fan. Another pilot from the same flight, Lieutenant Chin An-Yi, was slightly injured when his Hawk No. 2106 also ran out of fuel and ended up force landing next to an AA gun position.
So, the final tally for the day was 3 G3M's destroyed and one written off on landing. Actually, Chinese pilots made only 3 claims but AA gun crews also made 3 additional claims. As a result, 6 claims were submitted in total (and publicised for propaganda purposes).

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.

Wang Wen-Hua ended the war with 1 biplane victory, this one being claimed while flying the Curtiss Hawk III.

Claims:

Kill no.	Date	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1937
	14/08/37	1/3	G3M2 (a)	Shared destroyed	Curtiss Hawk III		Hangchow area	21st PS
1	15/08/37	1	Type 89 (b)	Destroyed	Curtiss Hawk III		Schien-chiao, Hangchow	21st PS

Biplane victories: 1 and 1 shared destroyed.
TOTAL: 1 and 1 shared destroyed.
(a) Mitsubishi G3M2 Model 21 from No. 3 Shotai of Kanoya Kokutai, JNAF, which crashed burning near the town of Banshan.
(b) 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:
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 and Tom Chan.