Wich of the following was an important challange of fighting a two front war for the allies

The best important challenge to fight two-front war for the allies was that supplying troops across huge part of globe.

The allies pushed Roman's troops out of Egypt. The troops were trapped against more allied forces in the West.

Two-front war is termed as the fight which takes place between two separate geographical fronts. The first two-front war occurred when Roman republic fought first Macedonian war in the the third BC century.