ROBERT GASTON HERBERT
THE WORLD SYNDICATE PUBLISHING CO.
CLEVELAND, O. NEW YORK, N.Y.
Copyright, 1919, BY
GEORGE SULLY & COMPANY
Printed in the United States of America
by
THE COMMERCIAL BOOKBINDING CO.
CLEVELAND, O.
AIR SERVICE BOYS OVER THE ENEMY LINES
CONTENTS
| CHAPTER | PAGE | |
| I. | Back of the Trenches | [1] |
| II. | The Winged Messenger | [10] |
| III. | A Spy Baffled | [19] |
| IV. | Praise From the General | [27] |
| V. | The Strange Warning | [35] |
| VI. | Looking Backward | [45] |
| VII. | The Great Day Arrives | [53] |
| VIII. | Over the Enemy's Lines | [61] |
| IX. | Winning His Spurs | [70] |
| X. | After the Battle | [78] |
| XI. | A Show on the Front | [85] |
| XII. | Clowns on the Wing | [94] |
| XIII. | More Work in Prospect | [103] |
| XIV. | Off on a Daring Mission | [113] |
| XV. | The Moonlight Flight | [120] |
| XVI. | Landing Close To Metz | [129] |
| XVII. | More Trouble for the Chums | [137] |
| XVIII. | The Lone House by the Roadside | [144] |
| XIX. | A Nest of Spies | [153] |
| XX. | Jack Climbs a Wall | [162] |
| XXI. | In the Old Lorraine Château | [171] |
| XXII. | Facing More Difficulties | [181] |
| XXIII. | Left Behind in the Enemy's Country | [191] |
| XXIV. | Troublous Times for Jack | [200] |
| XXV. | Back to Safety–Conclusion | [208] |