I have been able to find 2 signal fires to light but the third one is missing. The one that is missing is the one that is furthest west by the road. I have looked everywhere around here and is just missing. There is a bridge here but no signal fire to light. Any ideas what could have happened?

It's been a real long time since I played the game, but I seem to vaguely recall something about maybe being on a mountain above you (?). I also vaguely recall that I may have had trouble with this issue too, long ago.

From the mountains south of the road to Erathia, go to the border and turn around. Make your way back toward the village and the fire is on a ledge. It's a bitch to find but it's there.

Finally found it. That was hard to find. Thank you.....

Hint for next step if wanted
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Just use White Cliff Cave to get the Orc Army to show up

Sorry to ask for a spoiler, but not only has it been a long time since I played the game, but I don't see how White Cliff Cave gets the goblin army (I assume that's what you meant) to show up. AIR, the main purpose for entering that dungeon is to complete a quest that also allows you to access a particular minigame (itself the subject of a much longer quest).

The goblin army doesn't spawn as soon as you light the signal fires. You need to have a map transition after lighting all the fires, then they'll be there when you transition back. White Cliff Caves might be the only indoor map in Harmondale that can do it (Harmondale castle is a special dungeon, and I don't know if entering and exiting the castle will trigger the army spawn).