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An Anti-Aircraft Brigade was formed by the Royal Marine Artillery in
the Autumn of 1914 for service in the field. The equipment chosen for
this unit consisted of the Vickers Naval 2-pdr. automatic gun -
usually known as the “pom pom” - mounted on a PierceArrow 5-ton lorry
chassis, armoured.

The
establishment fixed for the R.M.A. A.A. Brigade was four batteries,
each with four guns, together with supporting transport and a
headquarters. Also included were twentyfour motor-cycle combinations
equipped with Maxim machine-guns. To ensure that the Brigade was
highly mobile, transport was on a generous scale, with thirty-four
Pierce-Arrow lorries and two Pierce-Arrow workshop vehicles. Although
there were only to be sixteen guns, forty-eight chassis were ordered
for them, the balance to be maintained as spares.

The
order for the armoured cars (also the Pierce-Arrow lorries and
workshops) was placed with Wolseley Motors Ltd., a subsidiary of
Vickers, on 30 December 1914. The PierceArrow chassis (imported from
the U.S.A.) used was a 14-foot wheelbase type with 30-h.p.
four-cylinder engine and shaft transmission to the rear wheels. The
wheels were the spoked artillery type with detachable rims and fitted
with solid rubber tyres, 36-inch singles at the front and 40-inch
twins at the rear. The armour protection was 5-mm. plate on thirty-two
vehicles and on the remaining sixteen was increased to
7.5mm with roofs of 5mm
plate. In addition to the "pom pom", one Maxim machine-gun was
provided, for which there were mountings on the side and rear doors
and at the front.

The
armoured cars were delivered by Wolseleys between March and June 1915
but the supply of “pom poms” could not keep pace and the cars for only
two batteries were equipped with guns by the end of April, when they
were sent to France. The guns for a third battery were received during
August and the Brigade was not fully equipped until September. Spares
for the “pom poms” were in short supply and during the Summer of 1915
there was a shortage of ammunition for the guns. In spite of these
difficulties, the R.M.A. A.A. Brigade did good work, the first
aircraft claimed to be shot down was on 30 April, two days after the
unit was first in action, and in all around twenty enemy machines were
hit and probably destroyed up to the time that the unit was
re-equipped with 3-inch A.A. guns (on different mountings) during the
Summer of 1917 and the “pom
pom” was withdrawn.
The
“pom poms” had a rate of fire of four rounds per second and could put
up a formidable barrage. Their range was short, originally under 3000
yards, but by improvements in fuses and ammunition this was
progressively increased so that eventually enemy reconnaissance and
bomber aircraft were forced to operate at over 10.000 feet, where they
were far less effective. During their time in France, the guns were
frequently operated from the same positions for extended periods, and
the scale of spare armoured cars turned out to be far in excess of the
requirements of the Brigade and so some of them were handed over to
the Royal Naval Air Service Armoured Car Division during
1915 and one car, at least,
fitted with a “pom pom” ended up in Russia with Locker-Lampson's
force.
Sixteen
other armoured cars, very similar in appearance to the Pierce-Arrows
were built by Wolseley Motors on Peerless chain-drive chassis. These
were built for Russia and delivered in 1916.
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