end helped the secret service men to capture a hidden German
submarine. They likewise helped to round up the fathers of Nappy Martell
and Slugger Brown. Mr. Martell and Mr. Brown were sent to prison on the
charge of aiding the enemy, while Nappy and Slugger were marched off to
a detention camp in the South. When being taken away Nappy and Slugger
were very bitter against the Rovers, and vowed they would square
accounts the first chance they got.

"And they will do it, too. You'll see," was Fred's comment. "They are as
mad as hornets, and they will do everything they can think of to make
trouble for us."

When the call for army volunteers came Dick Rover and his brother Sam
had lost no time in enlisting. At first Tom Rover had been unable to get
away. But soon the business in New York City had been left in reliable
hands, and the three fathers of the boys had gone to the trenches in
Europe to do their bit for Uncle Sam. They had been in several
engagements, and Tom and Sam had received shell wounds, while Dick Rover
had suffered somewhat from a gas attack.

"Well, we can be thankful that it is no worse," had been Jack's comment
on receiving this news from abroad. "Just the same, I wish this awful
war was at an end."

During the Winter Gif Garrison had received a letter from his uncle
stating that he and his chums might use a bungalow up in the woods known
as Cedar Lodge. Gif at once invited Dick Powell, often called "Spouter"
because of his fondness for long speeches, and the Rover boys to become
his guests on an outing to the lodge. And how all of the lads went to
that place has been related in detail in the volume previous to this,
entitled "The Rover Boys on a Hunt." In that book they came upon a house
in the forest, and there uncovered a most unusual mystery. They found
that some Germans were getting ready to establish a wireless telegraph
station, and aided in the round-up of these men by the United States
authorities.

Mixed up with the German sympathizers were Gabe Werner and Bill Glutts,
and these badly scared youths had all they could do to convince the
authorities that they were really patriotic. Glutts and Werner
considered that they had been brought into ill repute by the connivance
of the Rovers and their chums, and they were exceedingly bitter against
the cadets.

"We are certainly making some real enemies," was the way Jack expressed
himself. "First Nappy and Slugger, and now Glutts and Werner. Eve