Originally, he was to follow in his father's footsteps and study theology, but when he showed good understanding within mathematics and science, he got a desire for a career within the military.

[2] During the Theater War in 1788, Krebs was sent to Norway and took part in the advance against Bohuslän and the victory over the Swedes at Kvistrum bridge.

Here he successfully led the defense of Lier entrenchment,[2] and the counter-attack that drove the Swedes back across the border at Matrand.

Although the war ended with a Swedish victory after the Convention of Moss, Krebs was hailed as the "hero from Lier and Matrand",[1] and was considered to have saved Norway's pride in an otherwise despondently campaign.

On every 17 May (Norwegian Constitution Day) a garland is laid on the memorial by Hans Majestet Kongens Garde.