However, in August (old calendar) 815, Mutsu Province increased the number of troops and that of soldiers to 4 and 4,000, respectively, and always stationed 1,000 soldiers by having 6,000 soldiers in 6 troops in total work in 6 shifts.
しかし、弘仁6年（815年）8月に陸奥国は4団4000人を増員し、あわせて6団6000人から6交代制で常時1000人の軍団兵士を駐屯地に置いた。