The Balkan Peninsula- It was Located at the crossroads of three major empires Ottoman, Russian and Austro-Hungarian) and with access to several important waterways. (Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Kosovo, Montenegro, North Macedonia, Romania, Serbia, and Slovenia—with all or part of each of those countries located within the peninsula)
trench Warfare- men sitting in trenches and shooting into “No mans land” there was lots of death for minimal land gain.
Schlieffen Plan- a plan to quickly dispatch France before turning it’s forces on the non-industrialized Russia by quickly marching through Belgium to surround Paris