| Dates |
Events |
|
| February to September
|
Allied forces occupy the Jordan Rift Valley.
|
Details
|
| March 21 – April 5
|
First phase of the Spring Offensive, Operation Michael (also known as Second Battle of the Somme). The Germans obtain a Pyrrhic victory.
|
Details
|
| March 21 – April 2
|
First Transjordan attack on Amman.
|
|
| March 23 – August 7
|
Artillery bombardment of Paris.
|
Details
|
| March 30 – April 5
|
First Battle of Villers-Bretonneux, a phase of Operation Michael.
|
|
| April 1
|
Royal Air Force founded by combining the Royal Flying Corps and the Royal Naval Air Service.
|
|
| April 4–5
|
Battle of the Avre, final phase of Operation Michael.
|
|
| April 7–29
|
Second phase of the Spring Offensive, Operation Georgette (also known as Battle of the Lys). The results are disappointing for the Germans.
|
Details
|
| April 7–9
|
Battle of Estaires, first phase of Operation Georgette.
|
Details
|
| April 10–11
|
Third Battle of Messines, a phase of Operation Georgette.
|
Details
|
| April 12–13
|
Battle of Hazebrouck, a phase of Operation Georgette.
|
Details
|
| April 13–15
|
Battle of Bailleul, a phase of Operation Georgette.
|
Details
|
| April 14
|
Ottokar Czernin resigns as Austria-Hungary's Foreign Minister over the Sixtus Affair.
|
|
| April 17–19
|
First Battle of Kemmelberg, a phase of Operation Georgette.
|
Details
|
| April 18
|
Battle of Bethune, a phase of Operation Georgette.
|
Details
|
| April 21
|
The Red Baron is shot down over Vaux-sur-Somme.
|
|
| April 23
|
Guatemala declares war on Germany.
|
|
| April 24–27
|
Second Battle of Villers-Bretonneux, a phase of Operation Georgette.
|
|
| April 25–26
|
Second Battle of Kemmelberg, a phase of Operation Georgette.
|
Details
|
| April 28
|
Gavrilo Princip dies in Terezín prison, from tuberculosis.
|
|
| April 29
|
Battle of Scherpenberg, final phase of Operation Georgette.
|
Details
|
| April 30 – May 4
|
Second Transjordan attack on Shunet Nimrin and Es Salt.
|
|
