  Diagram 1.Diagram 2. Diagram 1.(a) Bombs can only be thrown from narrow trenches in the direction to which the trench is running. In order to have complete command of foreground with this type of Sap. it is necessary to make the cross-head too wide. (b) The total area of Sap. may become effective zone from the fire of one bomb. (c) Only two men can be employed at one time in constructing this type of Sap. Diagram 2.(a) Offers complete range of foreground with the narrowest possible width of trench. (b) Cannot become effective zone from the fire of one bomb. (c) A greater fighting area is possible in the same extent of frontage. (d) When connected up to form line of trenches from which to make assault, takes the place of an island traverse and relieves congestion of traffic at junction of communicating trench and fire trench. (e) More men can be employed in constructing same than in the T-shaped type. Bombers’ Training |
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