125.—The five cases of fire for effect.
If this cannot be done and the fire for effect materializes five cases are to be distinguished as the shells may be:
1. Shrapnel shells bursting at right height;
2. Shrapnel shells bursting high;
3. Time-Fuse high explosive shells bursting at right height;
4. Time-Fuse high explosive shells bursting high;
5. Percussion high explosive shells.
126.—Case 1. Burst Area of Shrapnel shells bursting at right height.
The area of burst is about 250 to 300 yards in length and 30 yards in width, half the bullets falling on the first 50 yards of the beaten zone.
127.—Protective Formation against Shrapnel.