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In Ancient Roman warfare, the testudo or tortoise formation was a type of shield wall formation commonly used by the Roman Legions during battles, particularly sieges. Testudo is the Latin word for "tortoise". The Greek term for this formation is "chelone" and during the Byzantine era, it seems to have evolved to what military manuals of the era call the "foulkon".
In the testudo formation, the men would align their shields to form a packed formation covered with shields on the front and top. The first row of men, possibly excluding the men on the flanks, would hold their shields from about the height of their shins to their eyes, so as to cover the formation's front. The shields would be held in such a way that they presented a shield wall to all sides. The men in the back ranks would place their shields over their heads to protect the formation from above, balancing the shields on their helmets, overlapping them. If necessary, the legionaries on the sides and rear of the formation could stand sideways or backwards with shields held as the front rows, so as to protect the formation's sides and rear; this reduced the speed and mobility of the formation, but offered consistent defensive strength against opposing infantry and excellent protection against arrows and other missile attacks.
- "Then the shield-bearers wheeled round and enclosed the light-armed troops within their ranks, dropped down to one knee, and held their shields out as a defensive barrier. The men behind them held their shields over the heads of the first rank, while the third rank did the same for the second rank. The resulting shape, which is a remarkable sight, looks very like a roof, and is the surest protection against arrows, which just glance off it."
- "This testudo and the way in which it is formed are as follows. The Baggage animals, the light-armed troops, and the cavalry are placed in the center of the army. The heavy-armed troops who use the oblong, curved, cylindrical shields are drawn up around the outside, making a rectangular figure, and, facing outward and holding their arms at the ready, they enclose the rest. The others who have flat shields, form a compact body in the center and raise their shields over the heads of all the others so that nothing but shields can be seen in every part of the phalanx alike and all the men by the density of the formation are under shelter from missiles. Indeed, it is so marvelously strong that men can walk upon it and whenever they come to a narrow ravine, even horses and vehicles can be driven over it."
The testudo was used to protect soldiers from all types of missiles. It could be formed by immobile troops and troops on the march. The primary drawback to the formation was that, because of its density, the men found it more difficult to fight in hand-to-hand combat and because the men were required to move in unison, speed was sacrificed. As "foulkon", it played a great role in the tactics employed by the Byzantines against their eastern enemies.
For if [the legionaries] decided to lock shields for the purpose of avoiding the arrows by the closeness of their array, the [cataphracts] were upon them with a rush, striking down some, and at least scattering the others; and if they extended their rank to avoid this, they would be struck with the arrows.
Rendered on Trajan's Column
- Plutarch: Antony, c. 45, quoted in Plutarch, Roman Lives, ed. Robin Waterfield ISBN 978-0-19-282502-5
- The Battle For Ukraine Is Being Fought Using Ancient Military Tactics, Geoffrey Ingersoll, Business Insider, January 22, 2014
- https://www.youtube.com/watch?v=R6llh_fe2kY Israeli forces combating riot. Arutz Sheva TV 13 OKT 2014
- Cowan, Ross, Roman Battle Tactics 109BC - AD313 (Osprey 2007)
- Rance, Philip, "The Fulcum, the Late Roman and Byzantine Testudo: the Germanization of Roman Infantry Tactics?" in Greek, Roman and Byzantine Studies 44 (2004) pp. 265–326: https://web.archive.org/web/20121013035512/http://www.duke.edu/web/classics/grbs/FTexts/44/Rance2.pdf.
- Plutarch, Roman Lives, ed. Robin Waterfield ISBN 978-0-19-282502-5 
- Dio Cassius, Roman History Book 49, 30 ed. Loeb Classical Library ISBN 0-674-99091-9
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