That was the Vietnam war
Gatling guns evolved into machine guns prior to WWII.
The Gatling gun made it's appearance on the battlefield during the American Civil war in the 1860's. Since this was invented long before WW2 started I would say that it's highly probable that a Gatling gun or some other form of mounted automatic was used in WW2.
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Before the Gatling Gun was invented, infantry stood in rank and file as they had been doing for centuries, and they tried to break the enemy line with volley fire (four shots a minute ideally) from muskets with a maximum range of 200 yards, and then they followed with a bayonet charge. The rifle should have changed all that, but generals were slow to invent new tactics for the new weapons. [The rifle only fired three shots a minute, but its range was about 600 yards.] Likewise, the impact of the Gatling Gun was less than it might have been. Custer was offered a battery of Gatling Guns before Little Big Horn, and he turned them down because they were too slow to keep up with his mounted troops. Also, the Gatling Gun required an enemy to march bravely in front of it, as the Zulu did in South Africa. Against a mounted enemy like the Boer or the Apache, the Gatling Gun had no use except as a weapon of deterrence.
The first ones had six barrels that used .58-caliber ammunition.
He invented the first successful machine gun called the Gatling Gun
The Gatling gun was designed in 1861 and patented in 1862
The gatling gun was invented by Richard Gatling in 1861 (it was a common weapon in the American civil war, i must add).
The original gatling gun shot a .45 long colt. But the more modern version invented by John Dylan shoots a .308 caliber rifle round. Also the larger gatling cannon shoots a 30mm round.
How did Richard J. Gatling make the Gatling gun
the first rapid fire gun was the hand crannked gatling gun used in the civil war but the maxim was the first true machine gun which was developed not long after the gatling
The first was the gatling gun invented in 1862
Gatling gun rates of fire depend on caliber, number of barrels and whether electric or hand powered.
The highest caliber machine gun in standard use is the .50 Cal. Gatling guns are used in 20mm caliber. XXXXXXXXX Russia and China use a heavy machine gun larger than the .50 cal BMG- it is the Vladmirov KDV (for the Russians), in caliber 14.5mm x 115.
1850's
The Minigun is Gatling gun where the barrels are powered by an electric motor. The Gatling gun, was a hand cranked, multi-barreled gun.