Weapons of defence greatly overpowered weapons of attack. Not to mention Generals like haig who still thought the cavalry was an excellent method of warfare. Haig is also good to consider in the use of tanks as he brought them in too quickly, they needed to be used in the right way.
These are the points i've written out for the dot point
Schlieffen plan failed
German and Allied armies spread from Switzerland to English Channel
East Germany defeat Russia and extend to Poland
Tactics of defence; based around trenches, barbed wire, machine guns, artillery bombardment
Defence superior to offence
An attack meant huge casualties and little territorial gain
Development of machine guns and magazine rifles
Nature of trench warfare didn’t favour frontal attack
Took generals a long time to rethink tactics
Neither side could gain advantage or make a major breakthrough
Allies land troops in Dardanelles (entrance to the Black Sea)
Use of gas (1915)
Air warfare, miners make tunnels under no-man’s land
Flame-throwers, planes and submarines
New tactics/strategies changes in leadership
Offensives (huge) Somme – relieve pressure at Verdun, artillery bombardment didn’t work, Britain 420,000 French 194,000 gained 77m/day at 3000 men, 1 man per 2.5cm of advance. And Verdun – February 1916, had symbolic importance, commanded entry to France, attrition, every hour 1000 shells fell on Verdun French 400,000, Germany 340,000
Try to get new Allies
Blockades (any ship that might bring supplies to other side)
Attrition
New battlefronts and methods ‘Bite and hold’ 'leapfrogging’ ‘infiltration’
Tanks (not effective till 1917)