The history of mankind is the history of wars. And the development of civilizations is full of uninterrupted wars: tribal conflicts, invasions of horse people, slave rebellions, feudal wars, and global warfare.
Since the 7th century B. C. in Ancient Rome there was the Temple of Two-faced Janus. Traditionally the gates of the temple were opened only in war time. As the history says, during the whole period of its existing they were closed only four times and the peace did not last long.
The peoples living on the huge territory of Eurasia were not isolated from each other, as they had constant cultural contacts, and they had conflicts too. On these vast areas great civilizations were born and died.
The migrations of peoples can be compared with the swing of a huge fantastic pendulum. From time to time different peoples left their homes for a better life. Plenty of them moved to the East Siberia and Asia with the purpose to capture foreign lands. Others moved in the opposite direction with the same purpose. In Bronze Age and in Early Iron Age, which followed it, a great amount of wars took place in Egypt, Mesopotamia, Babylonian and Assyrian empires. Later on, wars were unleashed by the great ancient military leaders: Alexander the Great, Hannibal, Darius and Julius Caesar. Plenty of people had to abandon the traditional lands and moved further to the East, Siberia and Asia, hoping to find safety there. In the 2nd and 1st millennium Before Christ there were series of military campaigns waged by the Indo-Aryan tribes. Since the 7th and 1st centuries B. C. it was Scythians, Sarmatians, Savromats and The Saka who redrawed the map of the Ancient World. Since the 1st—4th centuries A. D. numerous hordes of nomads, — Huns and mixed ethnicity tribes with Turkic peoples at the head, — moved to Europe. In the 13th-14th centuries Mongols’ armies under the leadership of Genghis Khan and later Timur the Lame conquered large territories in Eurasia. These campaigns changed the face of Europe.