Okay, so a long time ago, there was a place called Lapland. It was very cold and snowy there, and it was part of a big country called Finland.
But then, during a big war, another country called the Soviet Union wanted to take over Lapland. The Finnish army didn't want that to happen, so they fought against the Soviet army.
The Lapland War was a part of this big war where the Finnish army fought very hard to protect Lapland from the Soviet Union. It was very scary and dangerous for everyone involved.
In the end, the Finnish army was able to keep Lapland as part of Finland. But it was a hard battle and a lot of people were hurt and scared.
So that's kind of what the Lapland War was about. It was a war between two countries for control of a snowy place called Lapland.