the movements of troops, for preventing the
bringing up of supports, or for interfering with the action of
artillery. Owing to the deadly nature of poison gas shells, however,
the precautions given in paragraph 60 above, must be taken for all gas
shells. The goggles are intended for use after lachrymatory
bombardments only, in cases where the irritant gas persists in the
neighborhood.

K. Action Subsequent to a Gas Attack:

1. GENERAL:

The most important measure to be taken after a cloud gas attack is to
prepare for a further attack. The enemy frequently sends several
successive waves of gas at intervals varying from a few minutes up to
several hours and it is therefore necessary to be on the alert to
combat this procedure. The following measures should be adopted as
soon as the gas cloud has passed:

(a) Removal of respirators.--Anti-gas fans should be used to
assist in clearing the trenches of gas, so as to admit of
respirators being removed. Respirators and helmets must not
be removed until permission has been given by the Company
Commander.

A sharp look out must be kept for a repetition of the gas attack, as
long as the wind continues in a dangerous quarter.

2. MOVEMENT:

Owing to the enemy gas sometimes causing bad after effects, which are
intensified by subsequent exertion, the following points should be
attended to:
(a) No man suffering from the effects of gas, however slightly,
should be allowed to walk to the dressing station.
(b) The clearing of the trenches and dugouts should not be
carried out by men who have been affected by the gas.
(c) After a gas attack, troops in the front trenches should be
relieved of all fatigue and carrying work for 24 hours by
sending up working parties from companies in rear.
(d) Horses which have been exposed to the gas should not be
worked for 24 hours if it can be avoided.

3. CLEARING DUGOUTS AND OTHER SHELTERS:

It is essential that no dugout be entered after a gas attack event
with box respirators or helmets adjusted, until it has been
ascertained that it is free from gas. The only efficient method of
clearing dugouts from gas is by thorough ventilation. The older method
of spraying is not efficient.

An appreciable quantity of gas may be retained in the clothing of men
exposed to gas attacks and also in bedding, coats, etc., left in
sh