Julian Corbett was a very smart man who lived a long time ago. He loved learning about history and war, and he became really good at understanding how countries fight against each other. He was so good that he became a famous teacher and writer.
He was interested in something called "naval strategy," which means how countries use ships to fight in wars. He wrote a lot of books about this topic, and people still read them today to learn about the best ways to use ships in battles.
Julian Corbett was a very important person in history because he helped people learn about how to fight wars in a smart way.