The Roman History · Amm. 16.12.38

This disaster had arisen from the cuirassiers seeing their commander slightly wounded, and one of their comrades crushed under the weight of his own arms, and of his horse, which fell upon him while they were changing their position, on which they all fled as each could, and would have trampled down the infantry, and thrown everything into confusion, if the infantry had not steadily kept their ranks and stood immovable, supporting each other. Julian, when from a distance he saw his cavalry thus seeking safety in flight, spurred his horse towards them, and himself stopped them like a barrier.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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