In the XIV century. the first cannons appeared. At first they were cast from bronze or iron, later from cast iron. Mounted on carriages with wheels, the guns began to be used not only in the siege of fortresses, but also in field battles. Cannon volleys destroyed the walls of medieval cities, and then fortifications of a new type appeared. Hand firearms also appeared: by the end of the 15th century. – an arquebus, later a musket, and by the end of the 17th century. -gun with a bayonet.
Although in the fight against cavalry, the formation of soldiers armed with pikes was the most effective for a long time, the importance of the riflemen also grew. Pikemen and archers were not only the nobles. Among the professional military, in general, there were fewer nobles, although they still formed the basis of the officer corps and cavalry.
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.