ying
supplies.

Thirteen Bulgarian ships successfully bombarded the Greek port of
Kavala, then occupied by Allied forces.

Fort Saliff on the Red Sea was captured by British warships. Fort
Saliff is a Turkish fortress on the Arabian coast of the Red Sea.

Nothing of importance happened during June, 1917.

Early in July, 1917, a German submarine bombarded Ponta Delgada in the
Azores, but was beaten off by ships lying in the harbor, including an
American transport.

On July 17, 1917, it was announced that British destroyers had
attacked a flotilla of German merchant ships on their way from the
Dutch port of Rotterdam to Germany, sinking four and capturing four
others.

Mines, submarines, and explosions also made inroads on the naval
establishments of the various belligerents. During February, 1917, the
Russian cruiser _Rurik_ was damaged by a mine in the Gulf of Finland.
On February 28, 1917, a French torpedo destroyer was sunk by a
submarine in the Mediterranean.

On March 19, 1917, the French warship _Danton_ was torpedoed in the
Mediterranean, 296 of her crew having perished.

A mine was responsible for the sinking of a British destroyer on May
4, 1917, causing the loss of one officer and sixty-one men.

Mines also were responsible for the sinking of the French armored
cruiser _Kleber_ off Point St. Mathieu on June 27, 1917, with a loss
of thirty-eight men, of a British destroyer and of a German torpedo
boat in the North Sea, and, on June 30, 1917, of a Russian torpedo
boat in the Black Sea.

A torpedo sent the British auxiliary cruiser _Hilary_ to the bottom of
the North Sea with the loss of four men, while a collision was the
cause of the loss of a British torpedo boat.

On July 9, 1917, the British battleship _Vanguard_ of the dreadnought
class, 19,250 tons, was destroyed by an internal explosion while at
anchor in a British port.

According to figures compiled by the New York "Times" the naval losses
at the end of the third year of the war (August 1, 1917) had reached
approximately the following figures: Allied navies, 120 ships with a
total tonnage of 662,715; Central Powers, 122 ships with a total
tonnage of 387,911.

PART XIII--WAR IN THE AIR

CHAPTER CI

AERIAL WARFARE

As the war progressed the use of aeroplanes of all kinds became more
and more extensive. This was due chiefly to the wonderful progress
which had been made in aeronautics, the full story of which will not
be