The Western Front!
When the Schlieffen Plan did not work for Germany they switched to Trench Warfare.
The Western Front (in France and Belgium) where both sides were very evenly matched, and the defense proved much stronger than the offense. On other fronts in World War 1, trench warfare was not necessary.
your answer is in the category trench warfare was one of them there was also air warfare
Gas and artillery warfare. Artillery --> Guns.
The Germans faced France and French colonial forces, Britain and Britich colonial forces, and, eventually, the Americans on their Western Front in trench warfare. Austrian and Germans faced the Russians for a time on the Eaastern Front, some of that in trench warefare.
The technological innovations led to the trench stalemate on the western front in various ways. Each army developed entrenchments which they intended to use in the war and this is what propagated the Trench Warfare.
Two front warfare
Many soldiers killed on the Western Front of WWI because of the introduction of chemical gas and tank warfare. This happened due to the initial stalemate that had been caused by trench warfare.
trench warfare that kept both sides in virtually the same positions for four years.
Western Front
When the Schlieffen Plan did not work for Germany they switched to Trench Warfare.
The invention and use of tanks. Before tanks were introduced, much of the action on the western front was bogged down in trench warfare where progress over months was measured in yards. Tanks allowed armies to make real progress and break the stalemate of trench warfare.
The Western Front (in France and Belgium) where both sides were very evenly matched, and the defense proved much stronger than the offense. On other fronts in World War 1, trench warfare was not necessary.
your answer is in the category trench warfare was one of them there was also air warfare
The trench warfare. And the fact that both sides kept constantly sending more and more troops to the western front. So basically they go no where. If they try and advance there are machine guns and other artillary ready.
Gas and artillery warfare. Artillery --> Guns.
The Germans faced France and French colonial forces, Britain and Britich colonial forces, and, eventually, the Americans on their Western Front in trench warfare. Austrian and Germans faced the Russians for a time on the Eaastern Front, some of that in trench warefare.