After reaching my research material limit for the Battle of Thann, I have moved on to the Combat of Dunzling (Peysing) with General de Division Montbrun Light Cavalry Division and the 7e Legere. We are lucky to have the 5e and 7e Hussrds regiment histories found below.
However, we are also lucky to have a few biographies with some great small details from General Montbrun and Pajol. Also, we have a great memoir by Hippolyte d'Espinchal, who was a Capit. Adj. Maj. of the 5e Hussards. He was in constant contact with his Colonel d'Hery or Dery and well versed in the numbers of men per squadron and such administrative duties. So my question is do we believe d'Espinchal who was at the combat, or do we believe the detailed work by Martinien and the regimental history? I would usually say using both is the way to go, but some details do not match.
According to d'Espinchal, Colonel Dery was seriously wounded and forced to relieve command of the regiment on April 19th. He later writes Colonel Dery was forced to wear his arm in a sling. This shows nowhere in multiple secondary sources on the campaign or on his service record.