Legion Belge by Charles Dominique Oscar Lahalle (1832-1909)
I wonder if they're planning any 150th anniversaries of the campaigns in Mexico of c1865? . This would be in 2015? Anyway this is an interesting photo of Belgian Foreign Legion. The Battle of Tacámbaro
I reckon the first place to start researching this campaign is the Osprey The Mexican Adventure 1861-67 by Rene Chartrand and Richard Hook - two of the best contributors Osprey have.