"Don't you think I know!" shouted Russ, scrambling up out of the hole behind his fort. "Can't I feel it?"
Just then another paper "cannon ball" sailed into the fort from a sand hill back of it and it fell at the feet of Russ and burst, letting out a pile of sand.
"There!" cried Russ. "What'd I tell you?"
"But I didn't throw it!" said Laddie. "You looked right at me and I didn't throw it."
"No, you didn't," admitted Russ. "It came from in back of me. I wonder who's throwing sand cannon balls at us."
And then came another which hit Laddie, sending a shower of the gritty grains down his back.
"Hi! Quit that!" cried Russ. He and Laddie looked all around, but they could see no one. A mysterious enemy was shooting at them.