Q1. Were the Guard Light Cavalry...Lancers or Hussars???
A1. A 'composite' Regiment comprising: two squadrons of dragoons, one squadron of hussars, and one squadron of Guard Kosaken (added Feb. 1813). [In 1815 they were split up and bulked out into separate regiments by 'type'--Guard Hussars, Guard Dragoons, etc.]
Q2. What are Freiwilligerjager???
A2. "Volunteers". Usually scions of the middle classes who 'volunteered' for patriotic duty and provided their own arms, uniforms and horses at personal expense. (For some examples see: http://www.napoleon-series.org/military ... umann.html
Q3. What calibre guns were used by the Guard Horse and Line Horse Batteries.
A3. Guard Horse Artillery #4 - 6pdrs (von Willmann); Horse Btty #10 - 6pdrs; Horse Btty #3 (from Steinmetz) - 6pdrs.
Sources: George Nafziger, Lützen & Bautzen: Napoleon's Spring Campaign of 1813
; Chicago: Emperor's Press, 1992. David Nash, The Prussian Army 1808-1815
; London: Almark Publications, 1972.
Hope that helps.