The anti-tank battalion acts as the divisional commander's trump card when he finds himself in a critical situation. Until then it is kept in reserve. It is brought into action during a defensive action, when the enemy's tanks have broken through fairly deeply and once the direction of his main thrust can be clearly identified. In an offensive it is used when the division's main battle force has broken through in depth and the enemy is attacking its flank and rear. The battalion is armed with 18 100 or 125mm anti-tank guns and six anti-tank missile complexes.

The engineer battalion is used, together with the anti-tank battalion, to lay minefields rapidly in front of enemy tanks which have broken through, in order to stop them or at least to slow them down in front of the division's anti-tank guns. It also clears mines ahead of the division's advancing troops during an offensive and helps them to cross water obstacles.

The chemical warfare battalion carries out the measures necessary for defence against nuclear, chemical or biological attacks by the enemy.

The transport battalion supplies the division with fuel and with ammunition. Its 200 vehicles enable it to move 1,000 tons of fuel and ammunition at the same time.

The repair battalion recovers and replaces combat equipment.

The medical battalion does the same, but for the division's personnel.

The helicopter flight, which has 6 helicopters, is used for command and communications duties and to land the division's diversionary troops behind the enemy's lines.

The division has a total of 34 battalions. Those battalions which are subordinated directly to the divisional commander are given the designation `independent'-for instance `Independent Communications Battalion of the 24th Division'. This system is also used in all higher formations. For instance, an Army consists of divisions. But it also contains regiments and battalions which do not form part of its complement, which are called `independent' as, for instance in the `41st Independent Pontoon Bridge Regiment of the 13th Army'.

The total complement of a Soviet motor-rifle division is 287 tanks, 150 infantry combat vehicles, 221 armoured personnel carriers, 6 rocket launchers, 18 130mm heavy assault guns, 18 anti-tank guns, 126 self-propelled and towed howitzers, 96 mortars and multiple rocket launchers, 46 mobile anti-aircraft missile complexes, 16 self-propelled automatic anti-aircraft guns, and hundreds of light anti-tank and anti-aircraft weapons.

A tank division is organised in the same way as a motor-rifle division, except that it has three tank regiments rather than one and one motor-rifle regiment instead of three. In addition, a tank division has no independent tank or anti-tank battalions, since its anti-tank strength is much greater than that of a motor-rifle division.

A tank division has 10,500 men. It is equipped with 341 tanks, 232 infantry combat vehicles, 6 rocket launchers, 6 heavy assault guns, 126 self-propelled howitzers, 78 mortars and multiple rocket launchers, 62 self-propelled anti-aircraft missiles and artillery complexes and hundreds of light anti-aircraft and anti-tank weapons. While it has fewer personnel, a tank division has far greater striking power than a motor-rifle division.

Until the mid-1950s, divisions were organised in corps, and a number of corps made up an Army. However, because of the greatly increased combat strength of the divisions, and also because an Army Commander had acquired the means to control all his divisions simultaneously, the corps came to be considered unnecessary as an intermediate formation and was therefore abolished.

Today, however, a relatively small number of corps are left in the Soviet armed forces. They exist where a division is too small a unit for the task in hand and an Army too large.

From time to time in this book we have used the term `All-Arms Army'. This has been done in order to distinguish this type of Army from Tank Armies, Air Armies, Air Defence Armies and Rocket Armies. However, in normal usage the expression `all-arms' is not used; instead, the units concerned are simply referred to as the 13th or the 69th Army. Some have honorary titles, such as `2nd Shock Army' or `9th Guards Army'. These titles add nothing to the present-day strength of these armies-they are simply reflections of past glory. For instance, the 3rd Army, which has no honorary title, is considerably better equipped than the 11th Guards Army.

Sometimes Armies evolve along new lines but keep their former designations, which do not fit their present functions. Thus, the 2nd Tank Army is now an All-Arms Army. By contrast, the 3rd Shock Army, despite its designation, is in fact a Tank Army.

During the Second World War the Red Army had a total of 18 Air Armies, 11 Air Defence Armies, 6 Guards Tank Armies, and 70 other armies, of which 5 were known as Shock Armies and 11 as Guards Armies.

Today there are fewer armies but their strengths vary considerably. The Soviet Armed Forces now have 3 Rocket Armies, 10 Air Defence Armies, 16 Air Armies, 8 Guards Tank Armies and 33 other armies, a number of which are still referred to as either Shock or Guards Armies.

In the West it is firmly believed that today's Soviet Armies lack a clear organisational structure. A superficial analysis of the complement of each of the Soviet Armies seems to confirm this: some Armies have 7 divisions while others have only 3. The proportion of tank and motor-rifle divisions which they contain also varies constantly.

In fact, though, Armies do have quite clear organisational structures. However, the Soviet Union does not think it advisable to display this clarity in peacetime; this would throw too much light on their plans for war. Divisions have a high degree of administrative autonomy and can be quickly regrouped from one Army to another. In peacetime the system certainly does seem illogical, but once a war began each Army would take on an entirely clear shape.

There is one further cause for this apparent confusion. This is that the Soviet Union has forbidden its East European allies to establish Armies in either peacetime or wartime. If a homogeneous mass becomes too large it may explode. The Soviet High Command avoids this danger within the Soviet Army itself, by constantly moving the various nationalities around, to produce a featureless grey mass of soldiery, unable to understand one another. In peacetime, the armed forces of the East European countries only have divisions. In wartime these divisions would immediately join Soviet Armies which were under strength. This is precisely what happened in the summer of 1968.

In peacetime, these East European divisions see themselves as part of their own national armed forces. In wartime they would be distributed throughout the Soviet Armies; for administrative purposes they would come under their national Ministries of Defence and, ultimately, under the Commander-in-Chief of the Warsaw Treaty Organisation. For military purposes they would be subordinated to the Soviet Armies, Fronts and Strategic Directions and, ultimately, to the Soviet Supreme Commander and to his General Staff. It is because of this that the Staff of the Warsaw Treaty Organisation is a bureaucratic institution rather than operational headquarters. And this is why, in peacetime, many Soviet Armies appear unstructured. In wartime they would be brought up to strength with East European contingents and they would then assume their proper forms.

In wartime an Army consists of five divisions, one of which is a tank division, and the remaining four motor-rifle divisions. In various instances in which the mass use of tanks would be difficult, an Army may have nothing but motor-rifle divisions, which have only a limited number of tanks. But the Armies which are earmarked to operate in Western Europe are made up in this way-one tank and four motor-rifle divisions.