Fox

OK, I think you have the mood off here. I read your description beforehand and I heard everything you described....but I couldn't picture it. The solitary minor chord leading into the trumpets sounds like it could lead into something connoting a "crisis" but beyond that you go back into the happy melody. It feels almost like this:

"Hey, what's that!?" *the men draw swords*
"....oh, it's nothing, never mind." *The men sheath their swords and start playing in the field*.

I think you need to change the melody to fit in with the forboding minor chord you have coming in, and keep that going for a few phrases at least before bringing back the original melody. I also feel that the "heroic" part when you're done with the minor part of the melody needs to be vastly different from the first part of the piece - you need to give the listener something different to elevate these characters from "farmers" to "heroes".

Hope this was of some help, let me know if you have any comments or questions about what I said.