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Surveyor on the march using a groma; having planted it in the ground and checked from the plumb lines that it was upright, he would take a sight along the arms or strings to make a straight line or right angle. (Illustration by Jennifer Campbell from Antony Kamm, Scotland in Roman Times, Scottish Children’s Press 1998)
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Battle scene from Trajan’s column (cast), with (bottom right) medical orderlies tending the wounded. (VRoma: EUR (Rome), Museum of Roman Civilization: Barbara McManus)
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(Left) centurion; (centre) aquilifer; (right) signifer, who carried the century’s standard and looked after its savings bank. (Left and right, illustrations by Jennifer Campbell from Antony Kamm, Scotland in Roman Times, Scottish Children’s Press 1988; centre, illustration by John Pittaway from Picture Reference Ancient Romans, Brockhampton Press 1970)
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Drawing of auxiliary cavalrymen and horse. (VRoma: Landesmuseum, Mainz: Barbara McManus)
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A relief in the Louvre, Paris, from the period of Trajan and Hadrian, showing members of the imperial guard, indicated by their rich uniforms and helmets, and oval shields. Behind is a legionary standard, with the eagle holding a thunderbolt in its claws. (Deutches Archaeologisches Institut, Rome)
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Coin of Hadrian showing Roman naval vessel with oars and rowers. (VRoma: British Museum: Barbara McManus)
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From Trajan’s column (cast), men attack a wall under their shields; the formation was known as the “tortoise”. (VRoma: EUR (Rome), Museum of Roman Civilization: Barbara McManus)
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A selection of artillery and siege weapons. The largest and most effective was known as the onager (wild ass) because of its kick. Each century was allocated a mechanical arrow-shooter which was deployed in battle. (Illustrations by John Pittaway from Picture Reference Ancient Romans, Brockhampton Press 1970)