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In page Assassination:

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One of the earliest forms of defense against assassins was employing bodyguards, who act as a shield for the potential target; keep a lookout for potential attackers, sometimes in advance, such as on a parade route; and putting themselves in harm's way, both by simple presence, showing that physical force is available to protect the target,[1][2] and by shielding the target if any attack occurs. To neutralize an attacker, bodyguards are typically armed as much as legal and practical concerns permit.[citation needed]