Reperti sunt complures nostri milites, qui in phalangas insilirent et scuta manibus revellerent et desuper vulnerarent.

-- C. Iulii Caesaris De Bello Gallico I, 5

Many of our soldiers were seen leaping over the (enemy) phalanges, tearing away the shields with their hands and injuring from above.

(See also this quote from Florus, reporting the same event)

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Additus a. d. XVII Kal. Oct., MMDCCLXXVI a. U. c.