Should I use a small or capital letter referring to a tribe?

Hello,

Let's say there is a tribe called the Braves Tribe

When I refer to its people should I use capital or small letters?
Should I write the Braves are happy or the braves are happy?

Should I capitalize "tribe"? Should I write the Braves Tribe or the Braves tribe?

And finally should I capitalize "the"? Should I say I saw the Braves or I saw The Braves?