On August 16, 1864, Lieutenant-Colonel William Ames, Chief of Artillery of the Northern District (Morris and Folly Islands), Department of the South, provided an in progress report for the Third Major Bombardment of Fort Sumter. The bombardment, which started on July 7, was at that time in its sixth week. Ames provided this tally for the ordnance expended:
I have the honor to report the following number of projectiles and guns as expended in the bombardment of Fort Sumter from August 3 to August 14, inclusive: Three 200-pounder Parrott guns; 304 30-pounder Parrott shells, 299 100-pounder Parrott shells(*), 772 200-pounder Parrott shells, 13 300-pounder Parrott shells, 219 10-inch columbiad shells, 1,465 10-inch mortar shells, 108 13-inch mortar shells; total, 3,180.
The Third Major Bombardment had exceeded both previous “major” bombardments in terms of duration. But it remained behind the Second Major Bombardment in terms of number of shots fired at Fort Sumter. The problem facing the Federals was the amount of ordnance on hand – both guns and projectiles. Already the Army was forced to borrow from the Navy. And the Army lost three 200-pounder (8-inch) Parrotts during the first half of August.
The breakdown of rounds fired also illustrates some changes in the type of fires. Recalling Ames’ reports from July 26 and August 1 for comparison, consider the proportions. First from the period from July 7 to July 22:
More than half of the shots fired were from 100-pdr and 200-pdr Parrotts (that would be 6.4-inch and 8-inch for those who prefer the bore diameter designation… like me). The mortars provided a quarter of the shots fired. In the minorities were 30-pdr Parrotts, 300-pounder Parrotts, and the columbiads.
Then from July 23 to August 1:
The mortars increased in proportion to nearly a third. The 30-pdr Parrotts provided a quarter of the rounds fired. Triple the number of 300-pdr (I mean 10-inch) Parrotts. Four times increase in the proportion of the columbiad contribution. And decreasing noise from the 100-pdrs and 200-pdrs.
And from August 2 to August 14:
Now the mortars shouldered half the load. The 200-pdrs fired nearly a quarter of the shots. The columbiads sustained nearly the same ratio of shots fired. But decreases from all the other Parrotts. I’d love to see a breakdown of this on a day-by-day basis. Furthermore, a similar breakdown, even if week-t0-week, for the other major bombardments would be interesting.
What these charts are demonstrating is the nature of the Third Major Bombardment. By the start of the second month of work, the Federals turned increasingly to vertical fires. Some of the same reasons Federals at Petersburg brought up their mortars were at play. Recall the Second Major Bombardment turned to mortars in the later part of November. However, the Third Major Bombardment of Fort Sumter was burning out resources faster than they could be replenished on Morris Island.
∗The “printed” official records indicate this as “200-pounder Parrott shells” but given the sequence and other information surrounding this report, I think that is a misprint and sh0uld read “100-pounder Parrott shells.”
(Citation from OR, Series I, Volume 35, Part II, Serial 66, page 241.)