American Revolution monument - Nashville

I saw this when walking around the older Davidson County Court House. I didn't know anything about it - I'd never seen it or heard anyone say anything about it. But then, When looking at a 100+ year old picture of the court house before this one at the same location, I saw this monument there back then. Does anyone know how old it is? Also, who is that in the relief? Is it a local hero, or Francis Nash (who Nashville was named after) or anyone in particular?

Here is the faded etched text:
To the Heroes
of
1776

Not dead!-
But living in deeds such lives inspire.

Erected by the
Tennessee Daughters of the American Revolution