The dry, windy weather made things extra difficult for fire crews, along with the steep terrain.
Officials say the fire grew to 150 acres before crews could contain it.
Stay with WRCBtv.com for updates to this story.
PREVIOUS STORY: Firefighters continued to battle the large 80 acre brush fire on Signal Mountain, Wednesday. Officials say the blaze is now 75 percent contained.
"Today we came here this morning, there was a lot of black smoke on the very top," said Shannon Hayes Gann, Tennessee Forestry Division.
High winds, steep bluffs make day five as tough as any day before.
"There is actually a double bluff so there is two bluffs and that makes it to where we can't get our heavy equipment or our dozers in there on that," said Gann. " We have to put in hand lines and a lot of times you can't even climb up on the bluff."
Officials say the fire keeps jumping containment lines on the right side of mountain. Right now, fire breaks near the top and the left side of the 80 acre blaze are holding strong.
Two helicopters from the National Guard are here battling hotspots.
"It's just so dry that even the cliff duff is burning so it looks like the dirt is burning and then we have a lot of wind which is pushing our embers across our lines and we also have a lot of dead trees and even green tress that are falling across our lines," said Gann.
The Tennessee Forestry Division now has full command sending all volunteer firefighters back home to their families and jobs.
"We really appreciate their help so much and we could not have gotten to this point with out them," said Gann.
While no homes are are in danger, they need you to know they're not out of the woods just yet.
"We have had some people and some four-wheelers going into the woods and it's a very dangerous situation, there is a lot of snags that are falling and a lot of debris in the trees when the helicopters fly over knocking that debris down," said Gann.
A tree fell and hurt one of the firefighters on Tuesday, he's expected to be okay. Crews need onlookers to stay away because bulldozers are in there knocking down several trees and other burning trees are just tumbling down the mountain. Officials say you can expect to see crews out there for the next several days.