 Indeed, the troops were caught unprepared by the flooded countryside by the Chao Phraya, and were nearly wiped out by Siamese on their war canoes.In March 1586, Swa again led another expedition force (12,000 troops, 1200 horses, 100 elephants) from Lan Na into northern Siam.The goal was to seize northern Siam in preparation for a larger campaign planned for the following dry season.