<ul><li>The Brennan torpedo, invented in 1877 by Louis Brennan, was one of the first guided torpedoes.</li><li>It had no internal power source and operated by pulling a cable backward to propel the torpedo forward.</li><li>The torpedo had a pulley-type assembly with counter-rotating props and could be steered by adjusting the speed of the cables.</li><li>The Brennan torpedo was in service for over a decade before being replaced by torpedoes with internal power systems.</li></ul>

Pulling Backward to Go Forward: The Brennan Torpedo Explained

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