The baron and the vassals of the king ought to appear in his army when they shall be summoned, and ought to serve at their own expense for forty days and forty nights, with whatever number of knights they owe.[330] And he possesses the right to exact from them these services when he wishes and when he has need of them. If, however, the king shall wish to keep them more than forty days and forty nights at their own expense, they need not remain unless they desire.[331] But if he shall wish to retain them at his cost for the defense of the kingdom, they ought lawfully to remain. But if he shall propose to lead them outside of the kingdom, they need not go unless they are willing, for they have already served their forty days and forty nights. (_c_) WARDSHIP AND MARRIAGE Very important among the special prerogatives of the feudal lord was his right to manage, and enjoy the profits of, fiefs inherited by minors. When a vassal died, leaving an heir who was under age, the lord was charged with the care of the fief until the heir reached his or her majority. On becoming of age, a young man was expected to take control of his fief at once. But a young woman remained under wardship until her marriage, though if she married under age she could get possession of her fief immediately, just as she would had she waited until older. The control of the marriage of heiresses was largely in the hands of their lords, for obviously it was to the lord's interest that no enemy of his, nor any shiftless person, should become the husband of his ward. The lord could compel a female ward to marry and could oblige her to accept as a husband one of the candidates whom he offered her; but it was usually possible for the woman to purchase exemption from this phase of his jurisdiction. After the thirteenth century the right of wardship gradually declined in France, though it long continued in England. The following extract from the customs of Normandy sets forth the typical feudal law on the subject. Source--_L'Ancienne Coutume de Normandie_, Chap. 33. Heirs should be placed in guardianship until they reach the age of twenty years; and those who hold them as wards should give over to them all the fiefs which came under their control by reason of wardship, provided they have not lost anything by judicial process.... When the heirs pass out of the condition of wardship, their lords shall not impose upon them any reliefs for their fiefs, for the profits of wardship shall be reckoned in place of the relief. [Sidenote: The marriage of a female ward]