The battle of ‘Maeso’ Fortress has been paid attention in the study about during the Period of the War between Silla and T’ang dynasty in middle of 7th century. According to the Chinese records about the situation before the battle, it was mentioned that T'ang forces under the command of general Liu Rengui(劉仁軌) crossed the Limjin river, defeated the troops of Silla, and occupied the ‘Chiljung' Fortress. Also it was recorded that the troops of Malgal which was one of the tribe of the North-Western region of T’ang, advanced southward by ships. In other words, T’ang and Malgal were not separated troops that operated independently in the context of strategy, but a allied forces that advanced along both sides sea and land. As in the 『New Book of T'ang(新唐書)』, it is reasonable to assume that T’ang attacked the northern boundary of Silla.
Therefore, it was so risky to carry out a operation under the condition of the limitation that Tang’s supply ship could advanced too far to east. It meaned that they had to take risk of run out of supplies. So then, the final landing place had to be as possible as close in with the ‘Chiljung’ Fortress. As the result, the landing place of Malgal had to be the place that a ship could enter, and It should be somewhere between the mouth of Limjin river and Gorangpo. The author pays attention to U-po, also called the castle site of Geumpa-ri. It is reasonable to assume the place was the place to load and keep combat strength and supplies, and the rear base for advancing to the Chiljung-seong Fortress.
It is estimated that ‘Maeso’ Fortress was located in Yeoncheon or Yangju. If this fortress was located in Yeoncheon, it could be difficult to understand why the allied forces pulled out from the ‘Maeso’ Fortress and then marched to the ‘Chiljung’ Fortress in south. In other words, if the fortress was located in Yangju, it could be easy to understand the situations of battles that had happened while the allied forces was pulling out. Because it is possible to suppose the routes of retreat from various angles. This is the reason why the allied forces that advanced from north to south occupied the ‘Chiljung’ Fortress at first. A role of the ‘Chiljung’ Fortress is that it is easy to defend the uphill path of Seolma-ri that connected to a main road headed for Yangju and Han river.