1. By 1914, Europe was divided into two alliances - the Triple Entente of Britain, France, and Russia, and the Triple Alliance of Germany, Austria-Hungary, and Italy. 2. Austria-Hungary's declaration of war on Serbia in 1914 pulled the alliances into World War I. Nearly all of Europe was engaged in the massive war by August. 3. The conflict resulted in trench warfare along the Western Front in France and heavy fighting along the Eastern Front between Germany, Austria-Hungary and Russia that tied up hundreds of thousands of troops.

4. Central Powers and their Colonies

8. Mobilizing the troops

9. Mobilization

13. Central Powers

16. Allies in Green and Grey

20. Schlieffen Plan

23. Taxi to the Front

28. Trench Warfare

31. Russian Troops Marching

34. Russian troops moving to the Front

37. Russian Soldiers at the Eastern Front

40. EASTERN FRONT 1914

43. Russian Front 1917

45. Russian Land Lost to Germany 1917 Treaty of Brest Litovsk