Nils Christian Frederik Hals (April 23, 1758 – June 27, 1838)[1] was a Norwegian military officer with the rank of lieutenant colonel.

He received a verbal assurance from the regent of Norway, Christian Fredrik, that the fortress would not be defended if it were attacked.

Among other things, they had landed at Tangen at the southern tip of Kråkerøy and advanced to a position later named Svenskeberget (literally, 'Swedish hill') southwest of the fortress.

From there, the Swedish forces had good positions and the advantage of the height of the terrain, which allowed them to fire their cannons directly into the fortified town.

[3] He was sentenced to death by the Supreme Court of Norway on December 17, 1816;[2][3] however, in 1817 he was granted a royal pardon from Crown Prince Charles John of Sweden and Norway and dismissed from military service.