The four European fronts were:
The Western Front
The Eastern Front
The Gallipoli Front
The Italian Front
There were two other fronts in the Middle East:
The Palestine Front
The Mesopotamian Front
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Picture a box with four sides. Fighting on 1 side is one front. Fighting on two sides of the box is fighting on two fronts. Three sides of the box is 3 fronts, four sides of the box (surrounded) is fighting on four fronts. Two or more fronts is a multi front war.
Mobilise thus meaning Germany had to fight the war on two fronts
As you may know ww1 was not a Good four years for anyone.
Four
Most were approximately 7 feet deep and stretched for over 475 miles, though it varied between fronts.