Tradition
Eusebius of Caesarea
Life of Constantine
Book 2 › Chapter 17
Constantine's Victory
But as soon as he perceived that his adversaries persisted in their resolution, and were already drawing their swords, he gave free scope to his indignation, and by a single charge overthrew in a moment the entire body of the enemy, thus triumphing at once over them and their gods.
Source: Life of Constantine (New Advent)