Because of the dispersion of the artillery shells as is natural, there were too many 'overs' and 'unders', missing the objective on the narrow ridgeline. Such overs and unders would also affect the attacker since it (the attack) was on mountain slopes.
The Bofors were used in Direct Firing Role to achieve pin point accuracy with devastating effect, as also conservation of ammunition - an important logistic issue given that the single lane precipitous road was under direct enemy observation.
It maybe mentioned at these High Altitude heights there is no cover. Cavalier assault were also not feasible owing the the lack of oxygen which made movement slow and laboured. Therefore, close support was an absolute necessity till as long as possible and so safety distances of Direct Firing infantry weapons were reduced. Artillery in the classical mode of firing would have a greater safety distance owing to the natural dispersion pattern of shells being fired. Direct Firing of Bofors allowed one to overcome the natural disadvantage of the dispersion of artillery shell fired in the classical manner. This allowed the infantry to close in with close support of the Artillery in direct firing mode. The Bofors being capable of greater pin point accuracy than the other guns, having a greater devastation effect of its shell and being capable of faster loading, the number of shells effectively delivered were more and relentless. This had a devastating effect on the physical integrity of the defender's post and also on the enemy's morale. At the same time, it allowed the attacker to close in onto the objective closer with this devastating close fire support and in relatively greater safety.
The credit for deviating from the standard artillery practice goes to Lakhwinder, the Commander Artillery and then Maj Gen Mohinder Puri.
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