dimentary way in the Field Service Regulations 1929 (Polevoi Ustav
R.K.K.A. 1929, or PU-29 for short).
In the Soviet version of mechanised warfare derived from a
collective effort on the part of the Operational Faculty of the
Frunze Military Academy, and the Operational Directorate of
the General Staff under V. K. Triandafillov. The various no-
tions, as they emerged, were put to the test in field exercises
and command staff games, which did much to obviate the gap
between theory and practice which plagued the development
of armoured warfare in the West.
Having established the basic 'combined arms' principle, the
Soviets studied how it was to be applied at the grand tactical
level in the 'deep battle' (glubokii boi). From there they moved
onto 'deep operations' (glubokaya operatsiya) at the army and
army-group level. They knew that European Russia was open
to new forms of mechanised attack, and in 1933 the chief of
staff, E. I. Egorov, reported to the Revolutionary War Council
that it was technically possible for an invader to penetrate up
to six hundred kilometres, disrupting the Soviet mobilisation,
overrunning military bases, and seizing economically important
regions. The Soviet answers were expressed in the Instructions
for the Deep Battle (Instruktsii po glubokomu boiyu, 1935), and in
the very significant PU-36. The preferred option in both pub-
lications was offensive, and PU-36 enshrined principles which
remained unchanged for years to come.
The first task was to 'achieve the simultaneous destruction
of the whole enemy deployment to its full defensive depth'
(Kir'yan, 1982, 116). Wide sectors of the enemy frontage were
to be amused and held down by the weak forces of the 'pinning
group' (skovyvayushchaya gruppa), while at least two-thirds of
the combat strength was focussed in the 'shock group' (udarnaya
gruppa), where the Russians concentrated up to forty tanks per
kilometre. These machines were mainly the tanks of the Direct
Support Group (Gruppa NPP), which worked in close associ-
ation with the infantry, artillery and air forces to break through
the enemy tactical zone of defence.
APPENDIX: THE SOVIET STYLE