Assertion: battalion's casualty | /r/HasSubevent | the adoption
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Source sentences:
text: Casualties on the battlefield also led to the adoption, from around the Battle of Loos in September 1915 onwards of leaving behind the "ten percent"; this was approximately ten percent of a full strength battalion that would be left out of battle at the time of an attack or major offensive, so that if there were heavy losses, the battalion could be rebuilt using this nucleus.