Wubei Zhi (Vol. 55)

Surpassing a range of one or two dozen miles is the greatest of advantages. To fight one man is not as effective as fighting ten thousand. For a force of ten thousand, a single discharge that can hit dozens of cannons, affecting millions of troops, is the greatest of advantages. Using a sword is not as good as using a staff. When using a staff, first intersperse it with a firearm chong muzzle-loading firearm, then a spear, and add fire as well. This is the greatest of advantages.