For 26 years he worked for The Observer, of which he was later appointed assistant editor, mainly reporting on wars and trouble spots, starting in 1971 with the Bengali uprising in what was then East Pakistan (now Bangladesh).
He visited Cambodia and Vietnam during the closing stages of the American presence (1974–75) and remained in Saigon (Ho Chi Minh) after the North Vietnamese Army entered the city.
Smith later covered the Middle East, based first in Nicosia, then Cairo and Jerusalem and spending a considerable amount of time (1975–84) in Iran and Lebanon.
In 1991 he reported on the First Gulf War, entering Kuwait City with the US Marines, the siege of Sarajevo and the Rwandan genocide.
Singapore Burning is an account of the fall of Singapore to Japan's General Tomoyuki Yamashita in February 1942 which concentrates on the rearguard actions Australians, UK British and British Indian Army troops fought down the Malayan peninsula in the two months that preceded the surrender.