Nguyễn Ánh again took refuge with the Siamese court, and again tried to seek help from the Siamese. Resolving to muster any support he could from Western powers., Nguyễn Ánh asked Pigneau to appeal for French aid, and pledged to allow Pigneau to take his son Prince Cảnh with him. Pigneau in return attempted to obtain assistance from Manila, but the party of Dominicans he sent was captured by the Tây Sơn. From Pondicherry, he also sent a request for help to the Portuguese Senate in Macao, which would ultimately lead to the signature of a Treaty of Alliance between Nguyễn Ánh and the Portuguese on 18 December 1786 in Bangkok.