Chincha Rafts

These seem absolutely insane. Was just in a game where my Portuguese ally went water, and got absolutely and unrelentingly steamrolled by a handful of chincha rafts. It seemed there was very little that could be done about them, and looking at their stats... they are absolutely wild.

https://ageofempires.fandom.com/wiki/Chincha_Raft

They are available in Age II, can gather from fish/whales, and double as a warship... OK, except they also have as much attack as a Frigate for about a third of the cost, and almost as much siege range as a monitor.

They took my Portuguese ally completely off the water, and then proceeded to destroy everything even remotely coastal. They stood up decently to culverins, and wrecked all of our coastal defense buildings.

Has anyone else been completely chincha stomped? How do you counter this?