Francuski działon artyleryjski z armatą 4-funtową, okres napoleoński.

French cannon crew with a 4-pounder, Napoleonic times [/era].

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Note added at 3 hrs (2024-03-09 19:03:02 GMT)
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https://history.army.mil/museums/artifacts/0015_greatChainTr...

[...] flanked by two cannon from the Revolution: to the left a French 4 pounder, one of many guns sent as military aid for the Continental Army by France, [...]

'4-pounder' = '4-pounder gun' = '4-pound gun'

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Note added at 4 hrs (2024-03-09 20:10:13 GMT)
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https://en.wikipedia.org/wiki/Canon_de_4_Gribeauval

The Canon de 4 Gribeauval or 4-pounder was a French cannon and part of the artillery system developed by Jean Baptiste Vaquette de Gribeauval.

Crews
Any cannon could be served by as few as six artillerists, but to achieve maximum rates of fire more gunners were needed.[10] One authority counted eight men in the 4-pounder gun crews, including five specialists.[11] A second source agreed that the 4-pounder crew required eight men [...]

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Note added at 16 hrs (2024-03-10 08:14:29 GMT)
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'[...], Napoleonic period.'
(if in a caption etc.)