What is the significance of the song by Waris Shah in the story “The Dog of Tetwal”?

The action begins in the Indian camp, with Jamadar Harnam Singh on night watch. At two o'clock, he wakes Ganda Singh to take over the watch and lies down to sing a romantic song about a pair of shoes with stars on them. Banta Singh joins in with a song about love and tragedy. The soldiers feel sadness creeping over them; perhaps they are reminded that life should be about love rather than about war.