Possible Clues:

• Liquid injection given as a laxative
• People in A&E returned to get liquid injected
• Soldiers retreating during each evacuation procedure
• English soldiers put up with a procedure for evacuation
• Abhorred medical procedure
• Cleansing procedure featuring in hygiene magazine
• Hygiene manual may contain way to eliminate waste
• Unknown number removed from opposite side by a clear-out
• Laxative
• Purgative, emetic