Three 2nd Line regiments were formed in August and September 1914 at Dunkeld and Aberdeen, they moved to Kettering, Northamptonshire and formed 2/1st Scottish Horse Mounted Brigade; then at the end of 1915, they moved to Alford, Lincolnshire.
Therefore, TF units were split in August and September 1914 into 1st Line (liable for overseas service) and 2nd Line (home service for those unable or unwilling to serve overseas) units. They moved to Kettering, Northamptonshire and formed 2/1st Scottish Horse Mounted Brigade. At the end of 1915 they moved to Alford, Lincolnshire. 
