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How can the 1st Gren and 2nd Scots join 3rd brigade before that date of the brigade formation?

I understand they were already serving in other brigades and divisions.

Is it a typo and should it be the 15th and 18th of August?

3rd Guards Brigade was formed at Lumbres, near St Omer, France on 15 August 1915. The 4th Battalion, Grenadier Guards and 1st Battalion, Welsh Guards joined on 18 and 20 August, respectively, from England and the 1st Battalion, Grenadier Guards and 2nd Battalion, Scots Guards joined on 5 and 8 August from 20th Brigade, 7th Division. Nexus5 ( talk) 11:36, 24 April 2024 (UTC) reply