Considering the context, if the leader of the delegations representing the prisoners referred to Roman soldiers who escaped the battle as "good and giant soldiers," his remarks imply that those-like him-who surrendered are "cowards."
A good soldier is expected to win a battle or retreat by escaping the battle to come back to fight.
However, when soldiers surrendered against the orders in the enemy's face, this was considered a cowardly act. Therefore, such soldiers are described as cowardly.
Hence, in this case, it is concluded that the correct answer is "Coward."
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