The Event Time Forgot

This event will not be on the test.

Unkown event?

[Deathdonut]

It even predates spellcheck.

All I Could Find

[rtobyr]

On February 2, 1907, field artillery was separated from the Artillery Corps. On that date, the War Department redesignated the "Chief of Artillery" to "Chief of Coast Artillery" (effective July 1, 1908). See section 177.2 here [archives.gov]:

Chief of Artillery established as the ranking line officer of the Artillery Corps, consisting of both field and coast artillery, by General Order 9, War Department, February 6, 1901, pursuant to the Army Reorganization Act (31 Stat. 748), February 2, 1901. Redesignated Chief of Coast Artillery, effective July 1, 1908, by General Order 24, War Department, February 2, 1907, pursuant to an act of January 25, 1907 (34 Stat. 861), providing for the separation of the field artillery from the Artillery Corps. Abolished, with functions transferred to Commanding General, Army Ground Forces, effective March 9, 1942, by Circular 59, War Department, March 2, 1942, implementing the reorganization of the army mandated by EO 9082, February 28, 1942.