What military tactics were first used by Nevsky in the battle with the crusaders on Lake Peipsi?

Coming in a wedge into the offensive on the forward Russian regiment, a single formation of knights was immediately attacked from several sides. The formation of Russian soldiers that stood face to face took the brunt of the enemy blow. At the most decisive moment, the Livonian knights seemed to have been “taken in the pincers” by the blow of Alexander’s reserve troops from both sides. It was this tactic that brought victory in the battle.