Okay, so let’s pretend you and your friend decided to play a game of tag. You both live next door to each other, but you’ve never really liked each other very much. Now, you’re running around trying to tag each other, but suddenly you both start arguing about who has the right to tag who.
That’s kind of like what happened in the Dano-Swedish war of 1808-1809. Denmark and Sweden were two countries that were right next to each other, and they had a bit of a disagreement about who had control over some land in the north.
The war started with Denmark attacking Sweden, but Sweden quickly fought back and gained control of the sea. They were able to prevent Denmark from getting any more supplies or reinforcements, which made it harder for Denmark to keep fighting.
In the end, Sweden won the war and got to keep the disputed land. But the war had some pretty big consequences. For one thing, it helped to weaken Denmark and Sweden’s power in the region. And it also made people start thinking more about how countries should resolve their differences peacefully instead of with violence.