In the movie Gunga Din what was the name of the song the troops were singing as they marched to the temple?

"Will Ye No Come Back Again?" by Lady Carolina Nairne (1766-1845). It's a Jacobing Song, the tune was written and popular long after the rebellion was over.

In the film the Scottish Highlanders pipers are playing as their Regiment marched to the Temple.

Regards,

Luis Romano