 From 1903 to 1907, Barrette instructed at the Artillery School, and from 1907 to 1909 he was director of the department of artillery and gun defense at the Artillery School at Fort Monroe, Virginia.He commanded Fort McKinney in 1910 and in 1911 commanded the artillery district at Charleston, South Carolina.He was also lieutenant colonel of the First Provisional Coast Artillery Regiment and Coast Defense Officer of the Eastern Department.