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    As at the end of 1915, the Germans were winning in WW1 because the  German army opened the Western Front which aided the invading of Luxembourg and Belgium. They also gained   military control of strategic industrial areas in France.

The Western Front

The Western Front was one of the strategic theaters of war during the  World War 1. On the onset of the war in August 1914, the German military opened the Western Front by invading Luxembourg and Belgium, they continued by  overtaking  strategic industrial regions in France.

This military offensive was  halted at the Battle of the Marne.

   

    Both sides in the war resulted in the digging of trenches. To overcome this tactics of trench warfare on the Western Front, both sides tried alternative new military tactics which included poison gas, aircraft, and tanks.

Learn more about the Western Front at https://brainly.com/question/1289692