As many of us I presume, I am too a fan of multi-barreled Gatling type firearms.
I always found it odd not to be able to use them in WW1 and after.
Luckily, I stumbled upon the 37mm Hotchkiss revolver cannon, which was in use as a deck cannon and retired prior to WWI.
Now imagine my excitement when I found this one:


here is the text that accompanies it:
Letter on reverse (see next picture) with postage cancelled 2.12.15.
Commercial postcard, meaning the sender probably isn't in the picture. The men depicted above are from an unidentified Landsturm battalion. Indicators on the postcard's reverse, suggest the sender is from a reserve infantry regiment (12?).
Théâtre du Nord is a theatre located on the Grand Place de Lille in France. The building was erected in 1717, two years after the death of Louis XIV who had conquered the city in 1667. It then served as a garrison for the city guard, whose first mission was to establish order.
The Hotchkiss Revolving Cannon, a revolving barrel machine gun invented in 1872 by Benjamin B. Hotchkiss (1826-1885), founder of Hotchkiss et Cie.
It was a built-up, rifled, rapid-fire gun of oil-tempered steel, having a rectangular breech-block which moved in a mortise cut completely through the jacket. It was designed to be light enough to travel with cavalry, and had an effective range beyond that of rifled small-arms.
The revolving-cannon had five 37 mm barrels, and was capable of firing 43 rounds per minute with an accuracy range of 2,000 yards (1,800 m). Each feed magazine held 10 rounds and weighed approximately 18 pounds (8 kg).
The cannon was accompanied by a horse-drawn ammunition limber, which held 110 rounds plus six loaded magazines, totaling 170 rounds.