Pitched Battle:
When armies from both sides fight concentrated in a specific area without distinction between offense and defense.
As a representative example of a pitched battle, there's Napoleon's Battle of Waterloo.
Reserves. Cavalry. Regular corps. The Battle of Waterloo was truly an excellent pitched battle where all branches within became chess pieces.
In this battle, which is like a naval fleet battle occurring on land, there is one rule that must never be forgotten.
You must never, ever retreat.
From the classical era's Battle of Cannae to the Battle of Isandlwana just 35 years ago.
Regardless of era, in this battle pattern where both sides push their power-versus-power structure to the extreme to face the outcome, you must never show your back.
If I can kill the enemy, it's a distance where the enemy can kill me too.
It's an extreme battle method where both sides accept casualties to kill the other.