In my Georgia game, there was a decent sized island (perhaps 20-30 hexes) between my continent and the other one. I settled on the northern tip and fought a lot of barbarians. They were swordsman and musket barbs. I had infantry and a frigate but it was tough slogging. I eventually took their camp and finished off the last stragglers. Instantly after that, Japan pops up and thanks me for dealing with the barbarians. Then they promptly send an escorted settler towards the island. Lol.
I suppose they didn’t have the tech to effectively clear the barbs and took advantage of my hard work. It was nice of them to thank me, though.