Commander - in - chief Johan Laidoner reinforced the Estonian advance in the south , including Finnish volunteers , The Sons of the North , led by Col. Hans Kalm .
Among other units , a large part of the elite Latvian Riflemen were sent to stop the Estonians .
Commander - in - chief Johan Laidoner reinforced the Estonians advance in the south , including Finnish volunteers , The Sons of the North , led by Col. Hans Kalm .
Among other units , a large part of the elite Latvian Riflemen were sent to stop the Estonians .