The original Assault Rife appeared in WWII, (called the Storm Rifle which morphed into Assault Rifle) carried by German Soldiers.
It was a Select Fire Rifle with a 30 Rd Magazine that overwhelmed U.S. Soldiers wielding M1 Garlands using 8 Round Clips.
My dad was with Patton’s Third Army and I don’t think he ever said he was “overwhelmed”...