Civil War water gun and flame thrower
Beast Ben Butler, the most hated Yankee General, was enthusiastic about a new invention with which he would bring down the Rebs. "One man has brought a fire-engine, wherewith he proposes to squirt on earthworks and wash them all down! An idea that Benjamin Butker considered highly practicable. Then, with his Greek fire, he proposes to hold a redoubt with only five men and a small garden engine. 'Certainly,' said General Meade; 'only your engine fires thirty feet, and a minie rifle 3000 yards, and I am afraid your five men might be killed, before they had a chance to burn up their adversaries!'"
The flame thrower was proposed to the USN in the early 1810s or so and was rejected as barbaric.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!