Britain declared war with Germany at 11pm on August 4, 1914.
And to commemorate the 100th anniversary of the outbreak of the First World War, services and events will take place this week.
Wakefield Cathedral is holding a vigil service at 6pm on Sunday. The Mayor, Coun Sandra Pickin, and councillors will attend the service which includes music by Wakefield Metropolitan brass Band. All the lights in the cathedral except one will be turned off as part of the national Lights Out campaign by the Royal British legion to remember the fallen.
There will be a reading of war diaries by soldier John Garner, from the Royal Garrison Artillery 13th Mountain Battery.
In Horbury, people can join a service at the Parish Church of St Peter and St Leonard, Northgate, from 10pm on Monday. The Deputy Lord Lieutenant of West Yorkshire, Squadron Leader David Dinmore, will be there with his wife and councillors Janet Holmes and Rory Bickerton. Girl Guides and young people from Horbury Churches Together will be taking part in the service.
Also on Monday there will be a ceremony to unveil the poppy patch planted by councillors Charlie Keith and Martyn Johnson at the Outwood Memorial Hall at 11am.
Also to coincide with eth commemoration, Crigglestone parish councillor and historian Keith Wainwright has organised a display of around 120 photographs of villagers who served in the conflict. The exhibition also includes memorabilia, medal records and letters to their families.
Mr Wainwright said: “This has been an ongoing project for some time and we now have pictures of most of the local people who died in the war. Most of the photographs have been lent to us by their families and it will be a fitting tribute to the sacrifices their relatives made.”
The exhibition at Hall Green Community Centre, on Painthorpe Lane, is open betwteen 2pm and 8pm on Friday, 10.30am to 3pm on Saturday and 2pm to 5pm on Sunday.