The town of Avaskär, located just a few hundred metres north of present-day Kristianopel, was too difficult to defend from Swedish attacks.

[5] During the Kalmar War, prince Gustavus Adolphus of Sweden (1594 — 1632), took the town with a small force on June 25, 1611 and destroyed the supplies the Danes had stored there.

September 25 that same year the abandoned fortress was taken by Danish lieutenant colonel Lützow, who began shoring up the partially demolished fortifications and made Kristianopel a strongpoint for the Snapphane guerrilla.

Lützow was forced to yield Kristianopel on February 22, 1677, whereupon the fortress was razed to the ground and the burghers commanded to move to other towns.

[9] Kristianopel's distinctive status disappeared on 1 January 1952 (according to a decision on 14 December 1951) when the town was no longer counted as köping.

[11] In October 2015 Karlskrona Municipality decided to open a refugee camp in Kristianopel, giving shelter to 80 people.