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- For events that took place elsewhere in the Great War, see The Great War:18 May.
Lonsdale Battalion events that took place on 18 May.
- Battalion takes over the Authuille Sector from the 19th Lancashire Fusiliers.
- “New sector hotter in every way than any we have been in yet, but have far better dug-outs for Headquarters.” – Lt-Col. P. W. Machell 
- A party under Lieut. Barnes remains in billets at Bouzincourt.