Sutler (noun)

1. A civilian who sells provisions to an army in the field, especially in a military camp or fort.
2. A person who provides goods and services to an isolated community or group.

Origin:

From the dutch sutelaar, from sutelen ("to sell provisions"), from sut ("bag, sack") + -elaar ("-er"), from the verb helen ("to sell").

Examples:

1. The sutler sold goods to the soldiers in the fort.
2. The sutler's store was the only place where the soldiers could buy necessities.
3. The sutler was a valuable member of the army as he provided provisions to the soldiers.
4. The sutler was a welcome sight for the pioneers in the isolated community.
5. The sutler was a vital link between the isolated community and the outside world.