So, in the olden days, there were some islands called the Channel Islands that were very close to France. And back in 1940, there was a war going on between some big countries and France was one of them. Some people were afraid that the war might come to the Channel Islands and that it wouldn't be safe for people to live there anymore.
To keep people safe, the British government decided that they needed to evacuate the civilians from the Channel Islands. That means that they wanted all the regular people who lived there to leave and go somewhere else where it would be safer.
So, the British government made a plan to evacuate everyone. They sent boats to the islands to pick up people and take them to other places. They didn't just do it all at once though, because there were a lot of people who lived on the Channel Islands and they needed to make sure everyone had enough time to leave.
Some people didn't want to leave their homes because they didn't think it would be that dangerous, but the government told them it was very important for their safety. So, eventually, everyone who wanted to leave the Channel Islands was able to do so and they went to different places like England and Scotland. Some people even went to other countries like Canada and Australia!
It was a big operation to make sure everyone was safe, but in the end, it worked out and everyone was able to go somewhere else and stay safe until the war was over.