The Chants That Struck Fear In Many.
Throughout history, there have been many warring tribes and conquering armies that would yell out chants towards the enemy not only to intimidate but to encourage one another. Shouting is inherently aggressive and often the prelude to actual physical violence. Many believe God or the Gods would grant them strength and give them the power to defeat the opposition with supernatural abilities.
There were two common battle cries among the Vikings one which was to simply yell "Tyr!" - the god of war. The other "Odin owns you all!" would be said as they threw one spear over the heads of the gathering army. This was an emulation of the very first war in the world when the Allfather Odin flung a spear over the entire host gathered for battle.
In later periods as the Vikings who settled Normandy became to be known as Normans, they adopted a new battle cry that advertised their presence and nationality which struck fear in many. They were a force to be reckoned with. They would shout 'dex aie!' God our help! or God aid us! in their ancient Norman tongue. The Normans were famous for their conquest, aggression, power, and piety. They became later known as protectors of the weak, poor, righteousness and upholder of the law.