There were a variety of weapons housed inside the fort to attack enemy and defend the fort. There are basically two types of such instruments. One is sthira and the other cala. Arthashastra mentions enlists a number of weapons:<blockquote>सर्वतोभद्रजामदग्न्यबहुमुखविश्वासघातिसङ्घाटीयानकपर्जन्यकबाहूर्ध्वबाह्वर्ध्बाहूनि स्थितयन्त्राणि। (Arth. Shas. 2.18.5)</blockquote><blockquote>पाञ्चालिकदेवदण्डसूकरिकामुसलयष्टिहस्तिवारकतालवृन्तमुद्ग्ररगदास्पृक्तलाकुद्दालास्फोटिमोत्पाटिमोद्घाटिमशतग्नित्रिशूलचक्राणि चलयन्त्राणि।(Arth. Shas. 2.18.6)</blockquote>Dr. Raghavan in his Mechanical Contrivances presents a clear picture of the various [[Yantra Shastra (यन्त्रशास्त्रम्)|yantra]] or weapons used in forts.<ref name=":1">Raghavan, V. (1952) ''Yantras or Mechanical Contrivances in Ancient India''. Bangalore: The Indian Institute of Culture</ref>
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There were a variety of weapons housed inside the fort to attack enemy and defend the fort. There are basically two types of such instruments. One is sthira and the other cala. Arthashastra mentions enlists a number of weapons:<blockquote>सर्वतोभद्रजामदग्न्यबहुमुखविश्वासघातिसङ्घाटीयानकपर्जन्यकबाहूर्ध्वबाह्वर्ध्बाहूनि स्थितयन्त्राणि। (Arth. Shas. 2.18.5)<ref name=":0">Arthashastra (Adhikarana 2, Adhyaya 18)
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</ref></blockquote><blockquote>पाञ्चालिकदेवदण्डसूकरिकामुसलयष्टिहस्तिवारकतालवृन्तमुद्ग्ररगदास्पृक्तलाकुद्दालास्फोटिमोत्पाटिमोद्घाटिमशतग्नित्रिशूलचक्राणि चलयन्त्राणि।(Arth. Shas. 2.18.6)<ref name=":0" /></blockquote>Dr. Raghavan in his Mechanical Contrivances presents a clear picture of the various [[Yantra Shastra (यन्त्रशास्त्रम्)|yantra]] or weapons used in forts.<ref name=":1">Raghavan, V. (1952) ''Yantras or Mechanical Contrivances in Ancient India''. Bangalore: The Indian Institute of Culture</ref>