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Men often went to the recruiting office with their friends and ended up in the same group (or 'battalion') of the army.
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By the end of September 1914, over 50 towns had formed Pals battalions.
They knew the friends would be there to look after each other during the war.
One of the most famous Pals Battalions was a group of around 700 men from Lancashire called the Accrington Pals.
On 1 July 1916, the men were in northern France ready to fight along with thousands of other British soldiers.
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He called these groups ' Pals Battalions'.