there were many different battles
Chateau-Thierry, Belleau Wood, Saint-Mihiel and Meuse-Argonne.
Because soldiers fled from battles
Which 3 major battles?
they won by 10 battles and by the fat butts
let's just say a lot
There isn't enough space on this site to list all the battles of WW1. It was a global war with battles taking place in Europe, the Atlantic, Africa, Asia and along the coast of the Americas. To list all the battles would take a long time. The website First World War (see link) has an extensive list of the major battles.
Jutland in 1916 is the only major conflict at sea. On land there are many: Tannenberg & the Masurian Lakes in what is now Poland. In the west there is Ypres, the Somme & Verdun. In northern Italy there are the 11 battles of the Isonzo including Caporetto, where a young Wurtemberger called Erwin Rommel makes a name for himself.
major battles in the splendid little war of spain