or more of the country's population. This loss of manpower led to a shortage of farm labour, and a corresponding rise in wages. The great landowners struggled with the shortage of manpower and the resulting inflation in labour cost. To curb the rise in wages, the king and parliament responded with the Ordinance of Labourers in 1349, followed by the Statute of Labourers in 1351. These attempts to regulate wages could not succeed in the long run, but in the short term they were enforced with great vigour. All in all, the plague did not lead to a full-scale breakdown of government and society, and recovery was remarkably swift. This was to a large extent thanks to the competent leadership of royal administrators such as Treasurer William Edington and Chief Justice William de Shareshull. It was not until the mid-1350s that military operations on the Continent were resumed on a large scale. In 1356, Edward's eldest son, Edward, Prince of Wales, won an important victory in the Battle of Poitiers. The greatly outnumbered English forces not only routed the French, but captured the French king JohnII and his youngest son, Philip. After a succession of victories, the English held great possessions in France, the French king was in English custody, and the French central government had almost totally collapsed. There has been a historical debate as to whether Edward's claim to the French crown originally was genuine, or if it was simply a political ploy meant to put pressure on the French government. Regardless of the original intent, the stated claim now seemed to be within reach. Yet a campaign in 1359, meant to complete the undertaking, was inconclusive. In 1360, therefore, Edward accepted the Treaty of Brétigny, whereby he renounced his claims to the French throne, but secured his extended French possessions in full sovereignty. Government Legislation The middle years of Edward's reign were a period of significant legislative activity. Perhaps the best-known piece of legislation was the Statute of Labourers of 1351, which addressed the labour shortage problem caused by the Black Death. The statute fixed wages at their pre-plague level and checked peasant mobility by asserting that lords had first claim on their men's services. In spite of concerted efforts to uphold the statute, it eventually failed due to competition among landowners for labour. The law has been described as an attempt "to legislate against the law