Interest in light infantry tactics increased across Europe after the Battle of Valmy, where the Prussian line infantry proved unable to break through the French sharpshooters. Initially soldiers were drawn directly from the line infantry to fight as skirmishers instead, but in time many German-speaking states adopted "Jäger" to fulfill this role. In theory the "Jäger" operated in pairs to protect each other while reloading, and remained within 100–200 yards of close-order infantry on which they could fall back if they were endangered by cavalry or driven off by infantry. However, it was admitted that, due to the difficulty of controlling troops spread out in open-order and in the thick of battle, these guidelines might not always be followed. "Jäger" were allowed to act with a certain amount of initiative on the battlefield, unlike line infantry who were rigidly drilled and kept under tight control by their officers. For this reason, it was the most energetic and daring soldiers who were selected to become a "Jäger".