Analysis of information sources in references of the Wikipedia article "Second conflict in the Goryeo–Khitan War" in English language version.
From 1015 to 1019 there was incessant warfare, with attacks on Koryŏ in 1015, 1016, and 1017 in which victory went sometimes to Koryŏ, sometimes to the Khitan, but in sum were indecisive.