The Great Retreat was the retreat of the Royal Serbian Army through the mountains of Albania during the winter of 1915–16 in World War I. In Serbian memory and historical discourse, the event is often described as the Albanian Golgotha or Serbian Golgotha, due to the large number of casualties and hardships experienced by the retreating Serbian soldiers and civilians. It is considered to be a defining event in Serbian history.
In late October 1915, Germany, Austria-Hungary and Bulgaria launched a synchronised major offensive, under German leadership, against Serbia. Earlier that month, France and Britain landed four divisions at Salonika, under the commands of General Maurice Sarrail and General Sir Byron Mahon, to assist their outnumbered Serbian ally caught between the invading forces.