In the twelfth century AD, European elite warriors, knights, finding themselves in dire straits during battle, adopted the practice of surrendering themselves to adversaries who then guaranteed the safety of their prisoners. In turn, prisoners promised to pay a ransom to their captors, payment of which would free the prisoners and allow them to take up arms again. This practical transaction was considered honorable, even praiseworthy. Because ransoms could be substantial, it might be necessary for a prisoner to return to his lands to collect the funds. To do so, he would swear on his word of honor, parole d’honneur, to return with the required funds. The practices of honorable surrender, ransom, and parole were established in customary laws of war, and disputes between captors and their captives could be appealed to courts of honor. There were circumstances in which honorable surrender was not permitted. For example, military commanders could forbid their forces to accept surrenders until a battle was decided, lest their men disperse during battle to collect prisoners and ransoms. The recourse to honorable surrender was limited to the elites; common soldiers could be overwhelmed or killed outright in battle or siege.