- Britain declares war on Germany and sends BEF to France.
- The Miracle of the Marne - Paris saved - war of attrition begins.
- First Battle of Ypres virtually destroys old regular units.
- Build up of the BEF - supporting battles fought to assist French offensives.
- Second Battle of Ypres.
- First successful gas attack.
- Shell shortage scandal.
- Battle of Loos
- German attack on Verdun begins.
1st of JULY:
- First day of the Battle of the Somme.
- Tanks first used at Fiers.
- Battle of Arras - Canadians capture Vimy Ridge.
- Capture of Messiness Ridge by 2nd Army.
- Opening of the Third Battle of Ypres.
- Capture of Passchendale Ridge ends Third Ypres.
- Battle of Cambrai - use of massed tanks.
- First of German offensives strikes British 5th Army.
- Second German offensive on the Lys near Ypres.
- Third German attack - from the Aisne to the Marne.
- Battle of Amiens - 'the black day of the German Army.'
- Break through the Hindenburg Line.