Has there ever been a battle where modern machine guns were used

I'm pretty sure that happened during the Battle of the Frontiers.

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>>1397442
https://www.youtube.com/watch?v=sZTWCwqmgLc
The Rast Samurai

>>1397442

Yeah, and the horses won.

https://en.wikipedia.org/wiki/Charge_of_the_Savoia_Cavalleria_at_Isbuscenskij

>Corporal Lolli, unable to draw, as his saber was frozen in its sheath, charged holding high a hand grenade; Trumpeter Carenzi, having to handle both trumpet and pistol, shot by mistake his own horse in the head.

>>1397442
I do not think Gatling guns are modern machine guns. They came well after smoke less powder was invented.

>What is WWI