Tower Shield is a technology in Age of Empires: The Rise of Rome that can be researched at the Storage Pit once the Iron Age is reached and Iron Shield is researched. Once researched, it adds +1 pierce armor to all infantry units. Only a few civilizations can research it.
"The Romans adopted a tall rectangular shield that gave them advantages in battle when used properly. The size of the shield protected more of the body. The Romans fought in tight rectangular formations of approximately 100 men called maniples. The shields of the men in the maniple presented a continuous front, or shield wall, which protected them greatly from missile fire. They developed a formation variant called the Testudo (or turtle). In this formation, the shields covered all four sides and the heads of the men, allowing them to advance under missile fire. This was useful when advancing toward a gap in an enemy wall."—The Rise of Rome manual
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