| 21. | The wings were flapped by gunpowder charges activating a Bourdon tube.
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| 22. | During his reign, gunpowder weapons continued to be used effectively.
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| 23. | Gunpowder seems to have been widely known by the 13th century.
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| 24. | When he was 15 years old, he experimented with gunpowder.
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| 25. | Corning constituted a crucial step in the evolution of gunpowder warfare.
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| 26. | The garrison of Drogheda was critically short of gunpowder and ammunition.
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| 27. | The discovery of gunpowder obliged to new methods of defensive construction.
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| 28. | Gunpowder was discovered in the 9th century by elixir of immortality.
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| 29. | Gunpowder tea production dates back to the Tang Dynasty 618 907.
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| 30. | High quality gunpowder tea will have small, tightly rolled pellets.
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