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.