Brennan Torpedo
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The Brennan Torpedo was the world's first guided missile. Patented by Louis Brennan in 1877, it worked by 2 propellors that were spun by rapidly pulling out wires from drums wound inside the torpedo. Differential speed on the wires connected to the shore station allowed the torpedo to be guided to its target, up to 2,000 yards away.
After initial trials near Melbourne, an experimental station was established at Garrison Point Fort on the Thames, and operational stations established in the UK at Fort Albert on the Isle of Wight, Plymouth, and Gravesend. Stations abroad included Fort Camden, Cork, and Lei Yue Mun Fort in Hong Kong.
The only remaining original Brennan Torpedo is exhibited at the Royal Engineers' Museum in Chatham, Kent.