Hello,
I like the melancholic mood of the piece; surely can be useful for many occasions. It does not have any strong, ear-catching melody or harmony progression, which is very good because of the purpouse of the piece. I am not sure, what in this context "madrigal" means, so my remark might be inadequate, but since it's march and You write that people should be marching to it, I think that it would be good, if You add some rythmical section which would be beating the rythm throughout the piece, so the "marching part" is easier to follow (but without it I think it could be used in some movie eventually).
Best regards.