| No. 1 Battery (No 11 in Jones’s ‘Sieges’) | {2 24-pr. guns {4 8-in. hows. | {Against the Mirador {and castle, {and to enfilade {the land fronts. |
| No. 2 Battery (No. 12 in Jones’s ‘Sieges’) | 2 24-pr. guns | {Against defences: {only used two {days. |
| No. 3 Battery (No. 13 in Jones’s ‘Sieges’) | 4 24-pr. guns | For breaching. |
| No. 4 Battery (No. 14 in Jones’s ‘Sieges’[42]) | 12 24-pr. guns | For breaching. |
| No. 5 Battery (No. 15 in Jones’s ‘Sieges’) | {4 68-pr. {carronades | {Against breach, {and to annoy {defences. |
| No. 6 Battery (No. 16 in Jones’s ‘Sieges’) | {4 10-inch {mortars | {Against land front {and castle. |
| Total | 32 pieces. |
Major Webber Smith, R.H.A., was in charge of Nos. 1, 2, and 6 Batteries.
Lieut.-Colonel Frazer, R.H.A., was in charge of Nos. 4 and 5 (the breaching) Batteries.
Major Arriaga, Portuguese Artillery, was in charge of No. 3.
The officers in the various batteries were as follows:—
No. 1 Battery.—Captain Macdonald, and Lieutenants Brereton, Heron, and Williams.
No. 2 Battery.—Captain Deacon and Lieutenant England.
No. 3 Battery.—Captain Rosières and Lieutenant Costa (Portuguese).
No. 4 Battery.—Captains Dubourdieu and Parker, and Lieutenants Hardinge and Bloomfield of the Royal Artillery, and Lieutenants Silva and Judice of the Portuguese Artillery.
No. 5 Battery.—Captain Dansey and Lieutenant Johnstone.
No. 6 Battery.—This was not manned at first.
| No. 1 Battery | 4 18-prs. | {Against the convent up to 17 July, 1813. |
| No. 2 Battery | 2 8-inch hows. | Ditto. ditto. |
| No. 3 Battery No. 4 Battery | 6 18-prs. 2 8-inch hows. | {To annoy defences of land front, and support attack. Doubtless these included the guns from Nos. 1 and 2 Batteries. |
The officers of the Royal Artillery engaged in the left attack, were—
| Captain | Morrison. |
| ” | Power. |
| Lieutenant | Shaw. |
| ” | Oldham. |
| ” | Story. |
| ” | Stanway. |
The strength of the companies of Artillery before San Sebastian, on the 18th July, 1813, was as follows:—
| Captain Morrison’s (18-pr. brigade) | 162 | of all ranks. |
| Major Lawson’s | 57 | ” |
| Captain Dubourdieu’s | 66 | ” |
| Captain Parker’s | 68 | ” |
| Detachment | 17 | ” |
| Portuguese Artillery | 107 | ” |
| Total | 476 |
The ammunition expended during the first siege amounted to 27,719 rounds, and, as the batteries did not open until the 20th July, and the assault took place on the morning of the 25th, the rapidity of fire must have been excessive. In alluding to this, General Jones says: “The expenditure from the breaching battery alone, on the 22nd July, amounted to 350 rounds a gun, expended in about 15 hours of daylight. Such a rate of firing was probably never equalled at any siege, great accuracy of range being at the same time observed.” Captain Dubourdieu of the Royal Artillery was mortally wounded in the batteries on the first day; and the total loss of the Corps and the Portuguese Artillery during the first operation was 12 killed, and 44 wounded.