- CHAPTER I FOUR CHUMS ABROAD
- CHAPTER II THE NEWS OF WAR A
- CHAPTER III TAKING CHANCES
- CHAPTER IV UNDER SUSPICION
- CHAPTER V SIGNS OF COMING TR
- CHAPTER VI THE CAMP ON THE R
- CHAPTER VII WHEN THE STORM C
- CHAPTER VIII THE SPORT OF TH
- CHAPTER IX THE HUNGARIAN MOB
- CHAPTER X CLEVERLY DONE
- CHAPTER XI UNDER FIRE ON THE
- CHAPTER XII NEARING THE SCEN
- CHAPTER XIII THE BOY FROM SE
- CHAPTER XIV FRIENDS IN TIME
- CHAPTER XV THE BOOMING OF BI
- CHAPTER XVI UNDER COVER OF N
- CHAPTER XVII AMIDST BURSTING
- CHAPTER XVIII THE SMASHING O
- CHAPTER XIX THE AFTERMATH OF
- CHAPTER XX A RESCUE BY THE W
- CHAPTER XXI A HALF-WAY STOP
- CHAPTER XXII CONSTANTINOPLE
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