Ulyth was sharing quarters with Addie, Lizzie, and Gertrude.

She tucked herself up in her blankets, as she had been taught at camp drill, and then lay quietly for a long, long time, watching the patch of sky through the tent door.
She seemed only to have been asleep for about an hour, when the patrol touched her on the shoulder.

Instantly she sprang up, broad awake.
"Relieve sentry at west guard," was the order, and the patrol passed on.
It was too dark to see her watch, but Ulyth knew it must be nearly one o'clock.

She hastily donned the warm garments ordered to be worn by sentries, and hurried away to relieve Helen Cooper.

Her post was at the west end of the camp, where the field merged into a rushy swamp before it rose into the hill that led towards the farm.
"The password is 'Louvain'," said Helen, retiring, not at all sorry to seek the comfort of her bed.