The Gallipoli Campaign.—In the east the year opened with an attempt on the part of the Allies to force the Dardanelles with their fleets and take possession of the city of Constantinople. The campaign gets its name from the peninsula of Gallip´oli, the European shore of the Dardanelles. In February the campaign opened with a naval attack. The Turkish fortifications, however, were strong enough to defeat a purely naval attempt and the Allied fleets met with heavy losses. It has been stated since that had the Allies continued the attack one more day the Turks would have had to yield, as their ammunition was nearly exhausted. In April troops were landed on the peninsula to aid in the attack. The landing was accomplished at a terrible cost of life. Siege operations were then begun against the Turkish and German forces defending the peninsula. Month after month the fighting continued, but nothing worth while was accomplished. Finally, in January of the next year, the campaign was abandoned. It had cost the Allies heavily in money and lives, and its failure had lost to them the respect of the hesitating nations of southeastern Europe, Bulgaria and Greece.
The War on the Russian Border.—Along the Russian frontier also the Allied cause met with serious reverses. The year had opened favorably with the Russians in control of most of Galicia. In March the great Galician fortress of Przemysl, which had successfully withstood the attacks of the Russians the previous autumn, was compelled to surrender.
Meanwhile, in January, Russia once more attempted to carry out the other part of her general plan, the invasion of East Prussia. The Russian troops succeeded as before in entering the coveted territory, this time crossing the troublesome lake region while the waters were frozen. Soon, however, the invaders met with a decisive defeat. In the Battle of the Mazurian Lakes, General Von Hindenburg took 100,000 Russian prisoners; the number of killed and wounded Russian soldiers is said to have been 150,000. The Russians hurriedly retreated from German soil.
The time had now come for the Germans and Austrians definitely to assume the offensive. A strategic blow in Galicia imperiled the whole Russian front and compelled a general retreat of the Russian armies in Galicia and Poland. In June both Przemysl and Lemberg were recaptured by the Central Powers. By September all of Russian Poland had been conquered. Russia had lost 65,000 square miles of thickly populated territory. But the land was so thoroughly plundered by the German conquerors that many of the people died of starvation.
Bulgaria Enters the War.—The sympathies of the Bulgarian government had been with the Central Powers from the beginning of the war. Bulgaria had not forgiven the neighboring Balkan states for their treatment of her in the second Balkan war (1913). Against Serbia her feeling was particularly bitter. The Allied disaster at Gallipoli and the military successes of Germany and Austria in Poland and Galicia in the spring and summer of 1915 led the Bulgarians to believe that now was the time for them to strike. In October Bulgaria declared war upon Serbia, thus definitely taking her stand as an ally of the Central Powers.
Bulgaria's entrance into the war was followed by simultaneous invasions of Serbia from Austria and from Bulgaria. Under these blows the Serbians were crushed. Together with her neighbor and ally, brave little Montenegro, Serbia was overrun by her enemies. The cruelties inflicted upon the Serbian population by the invading Bulgars are said to have been fully as horrible as those which had taken place during the conquest of Belgium in 1914 and of Poland in 1915.
There was serious danger that the government of Greece would follow the lead of Bulgaria and also enter the war on the side of the Central Powers. This was prevented by two things. In the first place, a majority of the Greek people favored the cause of the Allies and were opposed to Bulgaria. In the second place, the Allies promptly landed an army at Salonica. Later on, they removed Constantine, the pro-German king of Greece, and placed his son Alexander upon the throne.
The East at the Close of 1915.—On the eastern front 1915 had been a year of failure. The Gallipoli campaign had been a humiliation for the Allies. The Russians had been driven from Russian Poland and from the Austrian province of Galicia. Bulgaria had joined the Central Powers, linking Austria-Hungary with Turkey. Serbia, the country whose quarrel had been the occasion of the whole world struggle, had been conquered by the enemies of the Allies.
Italy Enters the War.—In May, 1915, Italy declared war upon Austria, and more than a year later upon Germany. Her reasons for this action were: (1) her old enmity toward Austria; (2) her desire to annex the neighboring territory inhabited by Italians, but ruled by Austria; and (3) her feeling that Austria was opposed to Italian interests in the Balkans.
Italy entered the war with vigor although at a great disadvantage. When the northern Italian lands were freed from Austrian rule in 1866, Austria kept the highlands and mountain passes, from which she could easily descend upon the Italian lowlands. Now that war was begun, the Italians were compelled to force their way up the heights and against the fire from well-protected Austrian forts. Here upon the dizzy peaks of the Alps, or the icy surfaces of glaciers, or the rocky mountain sides, warfare has been more spectacular and has called for more daring and recklessness than anywhere else. Slides of rock and avalanches of ice sometimes have been the ammunition of armies. During the year the Italians made some progress and by December occupied positions well within the Austrian frontier; but no decisive battle had been fought or important city or fortress occupied.