Quis? Who was the man in the photograph?

The fifth in our series in which you must identify someone appearing in an usual and invariably ancient photograph.Please use the Comment facility to tell us whom you think it is.

Clues:

G.K. Chesterton once famously said that the subject was ‘full of piss and wind’.

Here he was acting as a war correspondent.

He lived to a great age, despite smoking.