What kind of weapon was a Brown Bess
Brown Bess to be a reference to Elizabeth I, possibly given to commemorate her death. The OED has citations for "brown musket" dating back to the early 18th century that refer to the same weapon. Another suggestion is that the name is simply the counterpart to the earlier Brown Bill. However, the origin of the name may be much simpler, if vulgar. Kipling's poem may have based his poem on an earlier but similar "Brown Bess" poem published "Flights of Fancy (No. 16) in 1792. Of course, the name could have been initially inspired by the older term of the "Brown Bill"
Brown Bess and perhaps the barrels were originally varnished brown, but it is well known in literary circles that the name "Brown Bess" during the period in question in the 17th to early 19th centuries is not a reference to a color or a weapon but to simply refer to a wanton prostitute [or harlot]. Such a nickname would have been a delight to the soldiers of the era who were from the lower classes of English and then British society. So far, the earliest use noted so far of the term "Brown Bess" was in a 1631 publication, John Done's "POLYDORON: