They stepped further along the trench.
"Captain," Prescott whispered earnestly, "I do not want to arouse any unfair suspicions, but I have something to tell you.

When I first looked over the parapet I noticed on the ground in front three small but distinct glows.

Then came the report and the shell.

Private Berger had stepped into the traverse at his right.
Immediately after the shell burst he came back into this trench.
When I looked over the top a second time I saw the same three tiny glows of light on the ground ahead.

Then came the second shell.