Hello Willie,
i know one or two sets on Tonkin campaign:
One is a small set (7 figures) regarding Tuyen Quang siege in 1885 by Sepp Nalter "Legion In Zinn" (
sepp.nalter@aon.at, please se in attach the typenlist)
The other one could be by Offizin Rücker (i've somewhere a paper catalog, but must be scanned), but i'm not so sure, could be on the later boxer rebellion
claudio