So, setting about it as methodically as men might smoke out a
wasps' nest, the Martians spread this strange stifling vapour over the
Londonward country.  The horns of the crescent slowly moved apart,
until at last they formed a line from Hanwell to Coombe and Malden.
All night through their destructive tubes advanced.  Never once, after
the Martian at St. George's Hill was brought down, did they give the
artillery the ghost of a chance against them.  Wherever there was a
possibility of guns being laid for them unseen, a fresh canister of
the black vapour was discharged, and where the guns were openly
displayed the Heat-Ray was brought to bear.