Salonika 1916

The Macedonian Front, also known as the Salonica Front (after Thessaloniki),
was a military theatre of WW1
formed as a result of an attempt by the Allied Powers to aid Serbia,
in the fall of 1915, against the combined attack of Germany,
Austria-Hungary and Bulgaria. The expedition came too late and
in insufficient force to prevent the fall of Serbia, and was
complicated by the internal political crisis in Greece.
Eventually, a stable front was established, running from the Albanian
Adriatic coast to the Struma River, pitting a multinational
Allied force against the Bulgarian Army, which was at various times
bolstered with smaller units from the other Central Powers.
The Macedonian Front remained quite stable, despite local actions,
until the great Allied offensive in September 1918,
which resulted in the capitulation of Bulgaria and the liberation of Serbia.
Macedonian front. Wikipedia
The Free Encyclopedia. September 13, 2022

Units involved Allied Army of the Orient<
Armée d'Orient-1st Serbian Army-2nd Serbian Army
British Salonika Army-Army of National Defence-35th Italian Division
Strength (1918) 717,000 men-2,609 artillery pieces-2,682 machine guns
6,434 automatic rifles-200 aeroplanes
VS Army Group Scholtz-11th German Army-1st Bulgarian Army
2nd Bulgarian Army-61st German Corps-2nd Bulgarian Division
3rd Bulgarian Division-302nd German Division-9th Bulgarian Division