Under his leadership, Latvia's first armed formations became battle capable. On 28 February 1919, Kalpaks was awarded the rank of Colonel. From January to March 1919 the 1st Latvian Battalion fought with the German VI Reserve Corps to repel the Bolshevik raids into Kurzeme and this was the start of Latvia's struggle for liberation. On 6 March 1919 near Airītes, by mistake, Kalpaks was killed in a skirmish with German Freikorps troops.