 But Galdan ended up with attacking the Khalkha lands, and Kangxi's responded by personally leading Eight Banner contingents with heavy guns into the field against Galdan's forces, eventually defeating the latter.In the meantime Kangxi organized a congress of the rulers of Khalkha and Inner Mongolia in Duolun in 1691, at which the Khalkha khans formally declared allegiance to him.The war against Galdan essentially brought the Khalkhas to the empire, and the three khans of the Khalkha were formally inducted into the inner circles of the Qing aristocracy by 1694.