Conversation so far:
What did Jean-Marie Le Pen do in the military?
Jean-Marie Le Pen was an intelligence officer for the French Foreign Legion.
where did Jean-Marie Le Pen attend college?
After his time in the military, Jean-Marie Le Pen studied political science and law at Panthéon-Assas University.
when did Jean-Marie Le Pen attend college?
Jean-Marie Le Pen attended law school in the 1940's.
what college did Jean-Marie Le Pen attend
Jean-Marie Le Pen entered the University of Paris and graduated from it in 1949.

Question: what battle did he first serve
Self-contained rewrite: In what battle did Jean-Marie Le Pen first serve?