In Chapter 12 of Rilla of Ingleside, the battle of Ypres is fought by the Canadians.

Nan had a letter from Jerry Meredith. “I came back to consciousness at dawn,” he wrote. “Couldn’t tell what had happened to me but thought that I was done for. I was all alone and afraid –terribly afraid. Dead men were all around me, lying on the horrible grey, slimy fields. I was woefully thirsty–and I thought of David and the Bethlehem water–and of the old spring in Rainbow Valley under the maples. I seemed to see it just before me–and you standing laughing on the other side of it–and I thought it was all over with me. And I didn’t care. Honestly, I didn’t care. I just felt a dreadful childish fear of loneliness and of those dead men around me, and a sort of wonder how this could have happened to me. Then they found me and carted me off and before long I discovered that there wasn’t really anything wrong with me. I’m going back to the trenches tomorrow. Every man is needed there that can be got.”

In Chapter 3 of The Story Girl, the well on the King family farm is likened to David’s

“It’s so pretty, when the vines leaf out and hang down in long festoons,” said the Story Girl. “The birds build their nests in it. A pair of wild canaries come here every summer. And ferns grow out between the stones of the well as far down as you can see. The water is lovely. Uncle Edward preached his finest sermon about the Bethlehem well where David’s soldiers went to get him water, and he illustrated it by describing his old well at the homestead–this very well–and how in foreign lands he had longed for its sparkling water. So you see it is quite famous.”

In Chapter 2 of Mistress Pat, Uncle Horace speaks of his longing for the well at Silver Bush.

“I got a drink of the old well while you were at supper,” said Uncle Horace in a different tone. “There’s none like it the world over. I’ve always understood David and his craving for a drink from the well at Bethlehem. And the ferns along the road from Silverbridge. I’ve smelled smells all the world over, east and west, and there’s no perfume like the fragrance of spice ferns as you walk along a P.E. Island road on a summer evening. Well, young folks like your girls and Judy mayn’t mind staying up all night, Alec, but I’m not equal to it any longer. Judy, do you suppose it’s possible to have fried chicken for breakfast?”

2 Samuel 23:16
King James Bible

And the three mighty men brake through the host of the Philistines, and drew water out of the well of Bethlehem, that was by the gate, and took it, and brought it to David: nevertheless he would not drink thereof, but poured it out unto the LORD.