In 1396 and 1444 there were unsuccessful campaigns against the Turks, from 1420 to 1431 – against the Hussites. Until the end of the XIV century, the crusades continued in the Baltic states – against the Prussians and Lithuanians; in 1410 the crusaders were defeated at the Battle of Grünwald. At the same time, the reconquista continued in Spain.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.