A vertical flame thrower is certainly an cool looking, if not terribly practical idea.
Britain’s Walls of Fire
Awesome flame defenses protected Britain against Nazi invasion in 1940
FIVE years after Britain’s darkest days, when invasion threatened hourly, it is revealed that a barrier of flame would have met the Nazis if they had attempted to storm the English coast. The coast and adjacent waters would have been set afire. Oil tanks were sunk in hillsides; pipelines ran out under the sea.