Yeah, ROC did it long time ago, after they got beaten by PRC in 1949. The Kuomintang remnants conducted guerrilla warfare in China mainland for some time. But guess what. What could they expect to use the same method of warfare to fight against the one who invented it?
But first thing first, when we talk about this ROC conducted guerrilla warfare at the southern part of Taiwan, we have to see it from the US perspective. And not ours. why they thought that ROC could halt the PLA invasion with guerrilla warfare? If my memory serve right, their war game was posted in this forum long time ago. They may effective or not. But in their point of view, it will work.
In that American wargame, they simulated a war between US and their allies, versus China and Russia. And the initial battlefield are in Ukraine and Taiwan. In that wargame, they won. I'm sure that some posters here remember that wargame. That news came long before Russia invaded Ukraine.
The objective of this ROC guerrilla warfare was to lock PLA in Taiwan long enough to let US and their allies prepared and pool their military power to fight against China.
I start to think that the reason why US incited Ukraine war and then Taiwan, based on this wargame scenario.
Now, if you think that it won't work, let me tell you. This is not my logic, or my thought. I just use one of American published wargame to give us some cases to discuss. Don't say about do you think or do you troll to me.
I certainly hope you're capable of understanding that everything the US writes should be understood with at least a grain of salt to say the least.
American simulations are subject to severe political control, so while they can provide a little bit of insight on their thinking, it should always be seen through the lens that it is not allowed to speak of defeat in America.
When things go poorly in simulations, parameters are often changed, like arbitrarily restricting the OPFOR to only using the Eastern theater command despite ostentibly China being under an all out invasion on a scale not seen since ww2.
Russia also seem to have expected to win the war against Ukraine quite fast in their simulations, yet looking at simulations from 1 side will only ever give you half of the picture at most.
What kind of guerilla warfare would ROC forces do against PLA when there is complete strike coverage 24/7? Besides, Beijing doesn't need to immediately hold the whole island, just sitting first with artillery/airpower from E. Fujian and then moving into N. Taiwan to continue shelling any eventual KMT strongholds in the south (even if its dubious that such strongholds could actually materialize), China can sit in the North for awhile, grinding down KMT while building fortresses in the North to step up defenses against US.
It is a matter of matching strike platforms to targets, and the power balance between PLA and KMT units look even worst than AFU vs LDPR units. For once, PLA can actually shell cities for massive damage and not single digit casualties.
As much as the Kiev/Sumy offensive was criticized by many on both sides, something like that might be the only way US can get ground against all the combined forces of China (not just ETC).
America needs to, on day 1, do a grand and unrealistically ambitious offensive, pull the attention of all the PLA forces, lose as little as possible while beating an organized retreat, while US forces do the equivalent of the Russian capture of the land bridge in the Taiwan area, establishing controls over islands, send in as many troops and equipment as they physically can and so on.
That way, it will be US with minor KMT backup vs China on Chinese soil, which is odds that are contestable for US at least, vs just letting the rebels get annihilated first and then queuing up to get shot at in no man's land while trying to storm beaches.