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A crossbow is a type of weapon, based on the bow, consisting of a horizontal bow-like assembly mounted on a stock, that shoots projectiles called bolts or quarrels. The medieval crossbow was called by many names, most of which derived from the word ballista, a torsion siege engine resembling a crossbow.[1]Historically, crossbows played a significant role in the warfare of East Asia, Europe and the Mediterranean.[2] The invention of the crossbow in ancient China caused a major shift in the role of projectile weaponry. The traditional bow and arrow had long been a specialized weapons system which required a considerable degree of lifetime training, physical strength and expertise to operate with any degree of efficiency; in many cultures, despite being usually drawn from the common class, bowmen were considered a separate and superior caste, as their archery skill-set (similar to many horseman cultures) was essentially developed from birth and impossible to reproduce outside a pre-established cultural tradition, which many nations lacked. In contrast, the crossbow was the first projectile weapon to be simple, cheap and physically-undemanding enough to be operated by large numbers of conscript soldiers, thus enabling virtually any nation to field a potent force of ranged crossbowmen with little expense beyond the cost of the weapons themselves.[3] In Europe, where crossbows became widely used in the early mediaeval period, this led to the ascendancy of large mercenary armies of crossbowmen (best exemplified by the Genoese crossbowmen), and the eventual death of the heavily armored aristocratic knight as armies became progressively dominated by conscripts equipped with increasingly-powerful ranged projectile weapons.[citation needed]

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The kite was first invented to fly soldiers to high places

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Paddleboats were up to 90 metres long and could carry up to 800 men

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The wheelbarrow was  used by soldiers in the armies of chuko liang

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The kite was first ivented in china

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The first wheelbarrow as made in the year 2000AD

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China first developed paddle boats in the year 5000BC