Hi John & DB 14
After the Captain J.S.Rothwell,R.A " The two guns of N/5 R.A., with their detachments turned out along with the other troops at 12 o'clok, and came into action on the left of the camp,and about 400 yards from it."
At 1.10pm,After the Captain J.S.Rothwell,R.A " The two guns ,after discharging a few rounds of case in the dense advancing mass of the enemy, limbered up and retired toward the camp ."
Conclusion = 70 minute of fire per gun at two shot per minute per gun = 138 shrapnel (21 balls of lead and antimony per 7- pr.Shrapnel...) + 2 case shot (70 balls of lead and antimony per 7- pr.Case Shot... ) = 140 shot per gun.
My calculation is correct ?