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15 pounder
Reference material by Wikipedia contributors. This retains its source identity and is not 411 news reporting.
15 pounder can refer to several British and US weapon systems:
Ordnance BL 15 pounder
Ordnance BLC 15 pounder
Ordnance QF 15 pounder
3-inch gun M1903, also M1898 and M1902 seacoast guns