A foot above the ground, beams and wooden piers were laid, followed by layers of planks, essentially hollow inside, yet supported by numerous well-trimmed sticks.
Additionally, with a large number of wooden nails, the framework of a camp's foundation gradually emerged, and the remaining task was to fill the vacant space between these elevated planks and the ground with insulation materials.
For this purpose, all the generals skilled in Qi Refining to Gang were summoned to plane shavings; around seven to eight thousand pieces of fine pine and fir wood were forcibly reduced to shavings, soaked in oil, and filled into the gaps between the planks and the ground.
Through nurturing, these oil-soaked pine shavings, combined with a large amount of sawdust, offered formidable insulation. After the efforts of over ten thousand Yuan Army members, after eight days, the Han Army finally completed the construction of their camp, covering an astonishing area of over 2,500 acres.
