There were still local warlords competing for Siam. Taksin marched first in 1768 to Phitsanulok to subjugate the Lord of Phitsanulok who ruled over Upper Chao Phraya Basin. Taksin was injured during the campaign and had to retreat. The war readily weakened Phitsanulok and then it was in turn subjugated by the Lord of Sakwangburi. The same year Taksin sent Thong Duang and Boonma to tame the Prince Theppipit – the ruler of Phimai to the north of Nakhon Ratchasima on the Khorat Plateau. The prince was a son of Borommakot and was defeated by Thonburi armies. Theppipit fled to Vientiane but was captured and then executed.