GDG- Calef's Battery and Buford's Division

[James Cameron]

<< The Cavalry Corps did not have a Reserve.  They had two horse artillery
brigades with a total of 9 batteries assigned. >>

In fact, none of the Corps had an artillery reserve.  The infantry Corps 
each had an artillery brigade.  There was an Artillery Reserve, of five 
brigades (one Regular, four volunteer), but that was an army-level 
formation.

Jim Cameron