Get ready...as a new army recruit you are about to be sent 'up the line' and discover how tough life is in the trenches.It's appallingTop Tips from experts- Change your socks at least twice a day to avoid trench foot - though this is easier said than done in a waterlogged trench- Bait the end of your rifle if you want to shoot a rat at close quarters.- When on night duty develop a sign language to communicate with your comrades.- Always carry your gas mask with you in case of an enemy gas attack.- Stop a carrier pigeon delivering its message by sending out a squadron of hawks