Well, its a matter of opinion, of course. I think a strong case could be made that the First Battle of the Marne was the most important WWI battle. This was the battle which stopped the initial German onslaught, saved Paris, and was followed by the "race to the sea" and the digging of the trenches. Had the French not been able to muster sufficient forces to fight this battle, or had they lost, the Germans could have defeated France in the first months of the war, which was their plan. The British Expeditionary Force was already having difficulties keeping a connection with the end of the French line, and had discussed withdrawing from the continent, a WWI Dunkirk. Amphibious operations would be necessary for a return to the European mainland, but the art of seaborne landings was undeveloped, as the British would demonstrate at Gallipoli in 1915. The British Army was relatively small, in any case. Throughout the war the British held only 50-70 miles of the 450 of opposing trenches. Without the much larger French Army to assist the outcome of continued warfare after a French defeat in 1914 would be unpromising.
The four most important battles were Battle of Verdun Battle of The Somme Battle of Ypres And the 1918 Battle of Amiens
actually i think it was the battle of Antietam the bloodiest battle in history
Canada lost 10,500 men at the battle of Vimy Ridge.
alliances is the most important long term reason
Hitler's actions were the most important.
Battle of the Somme
World War 2 Battle of Stalingrad Battle of Britain Battle of the Atlantic Battle for Midway Battle of Leningrad
The four most important battles were Battle of Verdun Battle of The Somme Battle of Ypres And the 1918 Battle of Amiens
it was the war somewhere in Europe it was the war somewhere in Europe
Stalingrad or El Alamein
The battle of the hamburgers. The German's supply of burgers was cut off so they invaded America to get more. This caused world war 1.
I'd say the Battle of Vimy Ridge in World War 1
ThE battle of Dunkirk
El Alemein
The Second Battle of El Alamein was perhaps the most important battle in the African theatre because it was the first major Allied offensive against the Germans.
Battle of Stalingrad. Click on the link to find out: http://en.wikipedia.org/wiki/Battle_of_Stalingrad
battle of Gettysburg