Ren Baqian's doubts were quickly dispelled by the answers he received from the frontlines and confirmed that his conjectures were correct.
That section of the Great Xia army obtained provisions from Yusheng City, which were enough to supply them with half a month of rations. This section then separated themselves from the supply line of Great Xia.
As a result, the speed of their military advance was impeded.
However, they were not bothered by this because the soldiers of the Protectorate General of the North were too busy to chase them, and they only needed to capture the rest of the cities within this half a month.
To put it simply, they were an isolated army.