Plan of the Siege of Frederiksten, 1718. Holm, Edvard. Danmarks Riges Historie, vol. 5, 1907. Public domain. Available from Wikimedia Commons.
On 30 November 1718, Charles XII of Sweden's troops attempted a siege on the Norwegian fortress of Fredriksten in the city of Fredrikshald (now Halden, Østfold). This was the last invasion of Norway during the Great Northern War. Charles XII was killed by a projectile while he was inspecting his troops' lines.
I am not sure if any of my ancestors participated in the Great Northern War, but I could have had ancestors on both sides, since I am both Swedish and Norwegian.
Siege of Fredriksten