However, one of the most fearsome weapon used by caliphate navy were a giant trebuchet named 'Arus' that used by Muhammad ibn Qasim when he besieged the port of Debal in India. It is said One of these machine required a force of 500 men to work its mechanism for discharging stone missile from its platform. the Arus stone missiles destroying the dome and the flag mast inside Debal and causing the port city defender terrified and lose heart, which immediately surrender to Ibn Qasim.
