Lybecker participated in Charles XII of Sweden's campaign against Poland during the Great Northern War, notably at the battle of Kliszów in 1702.

When the commander of the army in Finland General Georg Johan Maidel was dismissed in 1707, Lybecker was appointed as his successor.

He assembled his main force in Borgå, but when the enemy prepared for a landing there he withdrew further north without firing a shot and afterwards marched aimlessly around while southern Finland was taken.

After a drawn-out trial, where the bishop of Åbo Johannes Gezelius the younger testified against him, he was sentenced to "loss of life, honor, and property".

This article contains content from the Owl Edition of Nordisk familjebok, a Swedish encyclopedia published between 1904 and 1926, now in the public domain.