Things had been happening. Divisions were moving. There had been, there was going to be, a stunt. A battalion marched over the hill and sat down by the road. They had left the trenches three days march to the north and had come to a new country. The officers pulled their maps out; a mild breeze fluttered them; yesterday had been winter and today was spring; but spring in a desolation so complete and far-reaching that you only knew of it by that little wind. It was early March by the calendar, but the wind was blowing out of the gates of April.
This passage is from Tales of War (1918), a novel by Edward Plunkett, Lord Dunsany, about the Great War.
I do not understand 'stunt' at all. Is this a kind of a operational strategy?