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.
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.