Chronological events that took place in Serbia.
- 23 July – Receipt of Austrian note.
- 25 July – Serbian answer received: Austrian Minister leaves.
- 26 July – Mobilisation begins.
- 29 July – Austrian efforts to invade, continues until 12 August.
- 13 August – First Austrian invasion, continues until 25 August.
- 7 September – Second Austrian invasion, continues until 15 September.
- 8 November – Third Austrian invasion, continues until 15 December.
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Source: Lord Edward Gleichen (1918–1920). Chronology of the War. Volumes I, II & III. Constable & Company, London. (Copyright expired)