Attila, having an army of 700,000 men crosses the Rhine and defeats the King of the Burgundians, who intended to detain his advance.� He divides his forces into two armies:� one advances on Tongress and Airras, the other one, under his command, towards the Moselle Valley.� He destroys Besan�on and other cities of the Bourgogne. �He conquers the Eastern part of France and in the year 451, places Orleans under siege.� The Roman General Aetius and his ally Theodoricus, King of the Visigoths, gather and organize an army that they called the Roman Legions.� Regarding the King of the Visigoths, we should note that he was in the second period of great strategic victories.� His process was the following first period of great strategic victories, 150-300 (lasted 150 years), great depression, 300-402 (101 years), second period of great strategic victories 401-507 (106 years) and disintegration, 507-713 (206 years).� Its total duration was 563 years. Upon the advance of Aetius and Theodoricus, Attila lifts the siege on Orleans and executed a retreat behind Marne, concentrates his forces on the plains of Ch�lons, where his extraordinary cavalry had advantages in its actions. Aetius commanded the right wing and Theodoricus the left one, Sangipan, King of the Alans being in the center.� The attack is initiated by Attila charging over the right wing and being rejected by Aetius. Simultaneously, Theodoricus attacked the right wing of the Huns, successfully destroying it, but it cost his life. Facing this situation, Attila decided to retreat towards an area that he had previously fortified. There he maintained his position, until he retreated towards Italy with the rest of his army.� In his march he left desolation and death everywhere. He is said to have expressed:� �Grass will never grow again under the hoofs of my horse�. He destroyed Aquilea and many other cities of the North of Italy.� Due to the eloquence and majesty of San Leone, he stopped at the doors of Rome.� He demanded a tribute from the Emperor Valentino III and afterwards, returned to the jungles of the Danube. Victory over Attila was due to the mathematical-historical phase of the Visigoths in their second aggressive process or second period of Great Strategic Victories. The historical phase of the Romans also contributed to it. The Roman Empire disappears substituted by four rival Constantine kingdoms and the wars between them (306-337). In the year 405, the remains of the Roman Empire fall under the domination of the Germanic Empires, that is, it had its phase of disintegration (161-305) and afterwards, of relative independence until the year 405, in which the Germanics dominate.