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Caltrop - Wikipedia
The Caltrop: A Weapon That’s Barely Changed Over 2,300 Years - HistoryNet
蒺藜 - 维基百科,自由的百科全书
Water caltrop - Wikipedia
Medieval Weapons: Caltrops. Types of Caltrops, Facts and History
Water chestnut | Description, Species, & Facts | Britannica
Caltrop: An Ancient Weapon in Modern Warfare
Silent Defender: How Caltrops Shaped Ancient Warfare
Caltrop (Tire Spike) - CIA - The World Factbook
Caltrop Definition & Meaning - Merriam-Webster
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