XV THE MYSTERY OF THE FLEETS
Movements of British Battleships Veiled in Secrecy—German Dreadnoughts in North Sea and Baltic Ports—Activity of Smaller Craft—English Keep Trade Routes Open—Several Minor Battles at Sea
XVI SUBMARINES AND MINES
Battleships in Constant Danger from Submerged Craft—Opinions of Admiral Sir Percy Scott—Construction of Modern Torpedoes—How Mines Are Laid and Exploded on Contact
XVII AERO-MILITARY OPERATIONS
Aerial Attacks on Cities—Some of the Achievements of the Airmen in the Great War—Deeds of Heroism and Daring—Zeppelins in Action—Their Construction and Operation
XVIII BATTLE OF THE AISNE
Most Prolonged Encounter in History Between Gigantic Forces—A Far-Flung Battle Line—Germans Face French and British in the Aisne Valley and Fight for Weeks—Armies Deadlocked After a Desperate and Bloody Struggle
XIX FALL OF ANTWERP
Great Seaport of Belgium Besieged by a Large German Force—Forts Battered by Heavy Siege Guns—Final Surrender of the City—Belgian and British Defenders Escape—Exodus of Inhabitants—Germans Reach the Sea