Chapter II: Introduction: vii

LOCATION AND CONSTRUCTION OF TRENCHES 1

DUGOUTS 19

RESISTANCE OF ROOFING MATERIALS 24

DUMPS 25

LATRINES 27

REVETMENTS 28

Sand Bags 29

Corrugated Iron 32

Fire Platforms 34

TRAVERSES 36

LISTENING POSTS 38

OBSERVATION POSTS 43

Loopholes for firing 43

SUPPORT TRENCHES AND SUPPORT DUGOUTS 45

SUPPORT POINTS 46

RESERVE DUGOUTS 47

SECOND LINE 47

COMMUNICATION TRENCHES 48

SKETCH OF TRENCH SYSTEM 56

Section I 56

Section II 58

Section III 63