Whaleships were among the first regular visitors to this group of islands. The first recorded visit was by the "Rose" in February 1804, and the last known visit by the New Bedford ship "John and Winthrop" in 1887. In 1825, the trader Peter Dillon's discovery of sandalwood on the island of Erromango, highly valued as an incense in China where it could be traded for tea, resulted in rush of incomers that ended in 1830 after a clash between immigrant Polynesian workers and indigenous Ni-Vanuatu. Further sandalwood trees were found on Efate, Espiritu Santo, and Aneityum, prompting a series of boom and busts, though supplies were essentially exhausted by the mid-1860s, and the trade largely ceased.