http://pl.wikipedia.org/wiki/Stanis%C5%82aw_Kostka_Miel%C5%BCy%C5%84ski
Fitz-James :colonel - French spelling.
Bourdon, aide-de-camp to general Pecheux. An earlier, German text, has Bourdon, without rank as the aide.
Possibly Alphée BOURDON de VATRY, 27.xii.1791-25.vii.1871: Capitaine de Hussards (1813)