'Lest We Forget' comes from a poem, Recessional, written by Rudyard Kipling.
Kipling also created other iconic memorial wording, including 'Known Unto God'.
Many travel companies offer battlefield tours in Belgium and France, but it's easy enough to do it on your own with a quality guidebook, map and brochures from the local tourist office.
World War One Highlights
28 Jun, 1914:
Franz Ferdinand (Archduke of Austria) is assassinated in Sarajevo.
18 Oct, 1914:
The first Battle of Ypres begins.
1 Jul, 1916:
The Battle of the Somme begins.
6 Apr, 1917:
The United States enter the conflict by declaring war on Germany.
11 Nov, 1918:
Germany sign the armistice agreement to officially bring an end to the First World War.