Towards the Setting Sun, by crazyalmu007 & icedragon6171 (pg-13)

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Fandom Category: Mulan
Pairing: Mulan/Shang
Fic Title: Towards the Setting Sun
Author: crazyalmu007 & icedragon6171
Link: http://www.fanfiction.net/s/5577925/1/Towards_the_Setting_Sun
Rating/Warning(s): PG-13 (there is a part in chapter 10 that's rather sqicky for Disney (and sadly it doesn't involve a shirtless Shang, it's just sad and unsettling) so you might want to bypass it )
Genre: Adventure/Romance
WIP?: Yes

Why This Must Be Read:   The official summary:  Five months after the Hun invasion Shang appears at the Fa Family home. He is to head an army going west and has an important message for Mulan. What will happen? A tale of hardship and the love that blooms in the midst of battle. 

This is the only Mulan story I've found and liked which explores Mulan once again taking on the role of a soldier.  The author keeps her and Shang very much in character and builds some excellent tension between them.  Not only do they have to deal with yet another threat of invasion to China and fight those who protest a woman in the army, but Mulan and Shang must also learn to trust one another as officers and unweave the deeper feelings they have for each other.