Second battle of the Marne
The battle of the Somme and The battle of Verdun
Basra
The Battle of The Somme
The Gallipoli Campaign .
there is none. the longest war in world war 1 is world war 1. it would have to be the longest battle. :)*
World War I
The BATTLE OF JUTLAND was the largest naval battle in World War I.
World War 2 Battle of Stalingrad Battle of Britain Battle of the Atlantic Battle for Midway Battle of Leningrad
The: battle of Somme battle of Kut
Battle of Antietam
the red barron