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Lonsdale Battalion events that took place on 12 September.
For events that took place elsewhere, see 12 September on The Great War wiki.

1916

• The Lonsdales are relieved by the 17th Highland Light Infantry in front line trenches (Cuinchy Sector). Relief commences at 12:45pm and completes at 4:30pm.

1917

• Battalion situated in billets in Wulpen. Everything is quiet.