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 beyond 2100 m., shell with delay action fuze is capable of penetrating the splinter proof cover usually employed in the field. At ranges under 2100 m. its angle of fall is too small to make an adequate effect certain.

Time Shell, Model '98.

3. THE HEAVY FIELD HOWITZER.

The heavy field howitzer employs shell weighing 39.5 kg., containing an explosive charge of 0.85 g., and fitted with a percussion fuze either with or without delay action. This shell is designed to penetrate the roofs of splinter proofs. An earth covering 5-6 m. thick is necessary to afford protection against these projectiles. At 3000 m. a 15 cm. shell produces a crater 1 m. deep and 2.4 to 3.6 m. in diameter, i.e., 2 cu. m. (in made ground this crater is three times this size). The heavy field howitzer is a very effective weapon against shielded batteries. A single shell, owing to its lateral explosive effect, is capable of placing a whole battery temporarily out of action.

4. EXPEDIENTS FOR MINIMIZING THE EFFECT OF FIRE.

Movements of infantry under artillery fire are unavoidable when firing lines are to be reinforced and when troops intended for the decisive attack are to be pushed closer to the enemy. Formations calculated to minimize the effect of the