In mid-August, Major Coldevin began his invasion of Jämtland with 644 men, consisting of musketeers, dragoons, skiers and artillerymen.

[2] On the following day, on 17 August, Coldevin began the march back to Norway after the Swedish troops at Hjerpe entrenchment had received reinforcements.

[3] Christian August was very reluctant in the spring and summer of 1809 to make any Norwegian attack against Sweden,[4] but he was eventually pushed to it by King Frederik VI.

[6] However, on 16 July the advancing Norwegian army captured the Hjärpe entrenchment which just had been abandoned by a Swedish force of 200 men under Colonel Theodore Nordenadler.

But when a rumor that Sweden and Russia had started peace negotiations reached the Norwegian army, von Krogh chose to retreat and instead direct his attack against Härjedalen.