The first gun laid against Wagner
The ordnance corps mounted one 10-inch siege mortar in Battery O’Rorke — the first piece placed in position against Battery Wagner. Four 30-pounder Parrotts went in the same day at 1,830 yards. From fifteen pieces on the fifteenth, the Federal siege train on Morris Island grew to over a hundred guns.
Major Brooks’ journal, OR I, 28, Pt. 1