Okay kiddo, so there was this really smart guy in China a long time ago named Zhuge Liang. He was kind of like a wizard and he was very good at coming up with plans to win battles.
One time, there were some bad guys in the South of China who were causing trouble and making people upset. Zhuge Liang wanted to help the people, so he decided to go on a big journey to fight the bad guys and make things better.
But it wasn't easy, because the South of China was very different from the places Zhuge Liang was used to. The weather was hot and the terrain was tricky, with lots of mountains and rivers. He had to make sure his soldiers had enough food and water, and that they didn't get sick or tired.
So Zhuge Liang came up with some really clever strategies to outsmart the bad guys. He used a clever trick with boats to fool the enemy, and he also made up some fake orders to confuse them. He even made some decoys out of straw to make it look like he had way more soldiers than he actually did.
And it worked! Zhuge Liang was able to defeat the bad guys and make the people in the South happy again. It was a big victory for him and his army, and everyone thought he was even more amazing than before.
So that, my dear, was Zhuge Liang's southern campaign - a really smart guy going on a tough journey to help people in need and outsmarting bad guys with his clever plans.