This would leave other places in Norway temporarily weakened and give the Swedish troops an opportunity to initiate offensives elsewhere.

On 31 July the Swedish troops, under the command of Major General Carl Pontus Gahn, crossed the Norwegian border near Eidskog.

Major General Gahn's troops followed the main road towards Kongsvinger and faced early resistance from the Norwegian outposts at Matrand.

Colonel Andreas Samuel Krebs, who took the initiative that they would pull back to Lier entrenchment which was a much better defensive position.

They then drove the Norwegians back until the artillery from the positions at Lier effectively intervened and the Swedish attack broke down.

Colonel Krebs was hailed as a hero and promoted for the victory at Lier as well as the subsequent Battle of Matrand on August 5.