Regulation 23

(1)

Any person about to fire a shell shall determine the danger zone likely to be created.

(2)

No person shall fire a shell unless he has—

(a)

at each entrance to that danger zone either posted a sentry or placed an appropriate fence conspicuously marked with the words “danger” and “shot firing”;

(b)

ensured that all persons have withdrawn from that zone or have taken proper shelter; and

(c)

himself taken proper shelter.