If it were a war for freedom I could understand it and should be the first to enter the army; but to help England and Austria against the greatest man in the world is not right." Prince Andrew only shrugged his shoulders at Pierre's childish words.

He put on the air of one who finds it impossible to reply to such nonsense, but it would in fact have been difficult to give any other answer than the one Prince Andrew gave to this naive question.
"If no one fought except on his own conviction, there would be no wars," he said.
"And that would be splendid," said Pierre.
Prince Andrew smiled ironically.
"Very likely it would be splendid, but it will never come about..." "Well, why are you going to the war ?" asked Pierre.
"What for?
I don't know.

I must.

Besides that I am going..." He paused.
"I am going because the life I am leading here does not suit me!".