His cruelty and barbarity in punishing the rebels did not meet with the approval of Charles II., who is said to have remarked that "the old fool has put to death more people in that naked country than I did here for the murder of my father."
The war was carried on with great barbarity for about four years (1449-1453), and was in every respect a critical one.
A criminal code, scarcely equalled for barbarity, though twice mitigated by royal edict since 1785, remained in force in its main provisions till 1895.
Under the command of the lord of Lumbres, the lord of Treslong, and William de la Marck (lord of Lumey) they spread terror and alarm along the coast, seized much plunder, and in revenge for Alva's cruelty committed acts of terrible barbarity upon the priests and monks and catholic officials, as well as upon the crews of the vessels that fell into their hands.
Having once obtained a foothold in the country, they established their power over the entire valley and ruled with merciless barbarity, until they were expelled by the British in 1824-1825.