Found a very detailed description on the net on Chinese Coastal Defence (it's in Chinese); don't know how solid the information is.
http://washeng.net/HuaShan/BBS/jiangshu ... 4616.shtml
It provides some additional details on the Amoy landings as follows:
The 75th Division is one of those poorly equipped provincial divisions; it consists of 4 regiments (445, 446, 449 and 450) which were deployed along the coast near Amoy; with very few reserves further inland. The 3rd Battalion, 445th Regiment udner Wang Chien-chang bore the brunt of the Japanese landings; its 7th Company opposing the landings at Nichin was crushed and its commander killed in the initial fightings. It was forced to retreat to Yun Ting Shan (云顶山).
After daybreak the deputy commander of the 75th Division personally led the 1st Battalion of the 445 Regiment to reinforce the 3rd Battalion; it suffered over 50% casualties as it came under heavy Japanese naval fire. The remnants of the two battalions held their ground although their postions were virtually obliterated by Japanese bombardments. The 2nd Battalion was summoned to reinforce the Chinese line; incredibly it did not learn what happened to the 1st Battalion and suffered heavy casualties (its commander Yang Yung-shan was severely wounded) from the Japanese naval fire even before it reached the front lines. The supporting naval forces clearly played a key role in this battle and it was responsible for the virtual destruction of the entire 445th Regiment.
By the afternoon of the 7th, the Japanese has circled around the Chinese lines and threatened to encircle the remnants of the 445th Regiment. As night fell, the defenders escaped in small groups, and with no reserve close by, the door to Amoy was open.
At around 0800 on the 11th, the Japanese landed near Pai Shih Fort under the support of 3 destroyers and 2 gunboats. Since the ships were out of range for the guns in the fort, the fort was abandoned. The Japanese then attacked the neighbouring forts at Hu Li Shan (胡里山) and Pan Shi (磐石) and scattered the defending artillerymen.
Amoy was now virtually defenseless except for some local militia; they were scattered and then gunned down as they tried to escape by jumping into the sea.
Chinese after-action reports showed the effect of the naval bombardment: all bridges, roads, ferries and ships were targeted causing major disruption in communication and heavy personnel losses; one of the reinforcing regiments could not get its orders to move forward because its communication lines were all cut. The Chinese troops tried to put up a fight, but were hampered by poor deployment of the troops (all troops deployed near the coast and hence little chance for reinforcement) and vast disparity in firepower between the two forces.
Note there is quite a bit of information regarding the Hu Li Shan Fort here, including details of its twin 280 mm guns and other armaments:
(lots of information on the Internet regarding this fort as it is now a major tourist spot)
Note that its description claimed that the Chinese troops trapped within the fort did not give up and repelled all Japanese attacks, and eventually have to be evacuated with the aid of neutral (American and British) vessels. This clearly contradicted the account given above, not sure which is correct.