first appearance - Which movie holds the record for using the highest number of extras in a scene?

The record for most extras is with 1982 classic Gandhi, which used over 300,000 extras for the funeral scene.

IMDb Trivia snippet:

300,000 extras appeared in the funeral sequence. About 200,000 were
volunteers and 94,560 were paid a small fee (under contract). The
sequence was filmed on 31st Jan 1981, the 33rd anniversary of Mohandas
K. Gandhi's funeral. 11 crews shot over 20,000 feet of film, which was
pared down to 125 seconds in the final release.