“Are you sure you didn’t put in any stones?” and the military instructor turned to Randy.

“Nothing but the newspapers, Captain. I am positive of it.”

“In that case how do you account for the cannon exploding? It undoubtedly needed cleaning, but it was too heavy a piece to blow up with nothing more in it than a blank BB 27 charge. Well, the three of you go to the office and report to Colonel Colby when he comes in,” ordered Captain Dale. “We’ll have a thorough investigation of this as soon as the excitement is over and we have found out how badly those cadets are injured.”

“Can’t we go and see if Jack is all right first?” questioned Andy.

“Yes, you may do that. But don’t waste any time. I ought to place you under arrest, but if what you say is true about using only a small blank charge, evidently you meant it only in fun to help along the celebration. Of course, you had no right to take anything out of the powder house. But that point can be settled later.”

In the meanwhile the excitement among the cadets was gradually calming down. It was found that Ned Lowe had been struck in the shoulder and a cadet named Grimshaw had been hit in the back, while several others had received minor injuries. Both Lowe and Grimshaw were severely bruised and were sent to the school, there to be placed under the matron’s care until a doctor could be summoned.

“Jack! are you all right?” questioned Fred, as he ran up to his cousin, followed by the twins.

“All right, except that a stone or something flew right past my face,” was the reply. “Who shot off that cannon?”

“We did,” answered Andy, indicating himself and his brother. “But we didn’t know the confounded thing was going to bust,” and thereupon the twins made a complete confession, Jack, Gif, Spouter, and a number of others listening with interest. Then the three Rover boys went to the office as ordered.

Flashlights and lanterns were brought into play, and it was soon ascertained that none of the broken parts of the cannon had come near where the cadets had been celebrating. Pieces of cannon had struck behind the gymnasium and along the lake front, and other pieces had probably gone into the water.