Instead they fought a series of heavy somewhat independent sector skirmishes involving battalion occasionally brigade level forces supported by artillery and air strikes, and occasionally tanks. Extensive mopping-up operations followed these skirmishes. Where fixed positions as in Bhaduria, Hilli, Jamalpur and Kamalpur were assaulted, the defenders resisted stoutly. Eastern Command did a good job. Blitzkrieg's essence is speed.
All arms combine to punch holes along a narrow front.
Thus tank spearheads of Rommel's 7th. The Indian Army's equipment, training and outlook plus the Bangladesh terrain made such prolonged and swift movement impractical and unimaginable. Nevertheless, Aurora's three corps made good gains in the war's early days. Thereafter, movement slowed due to terrain difficulties and lagging logistics. Bde captured Tangail on 11 December afternoon.