In his latest blog posting, Advani refers to a book by V P Menon, who worked under Patel during the integration of 564 princely states into the Union, and says the Home Minister sent in the army despite Nehru's opposition.
He further says quoting from another book, M K K Nair's "With No Ill Feeling to Anybody" that Nehru favoured the UN route for Hyderabad- as he had done for Jammu and Kashmir- but Patel decided to use force to subdue the Nizam when he showed reluctance to fall in line.
BJP has often alleged that Nehru's decision to take the Jammu and Kashmir integration issue to the UN was a wrong move.
It is against Article 370 of the Constitution which bestows special status on the border state.
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Advani had demanded revocation of the Article recently, leading to a war of words between him and Chief Minister Omar Abdullah.
Advani also highlights that there was no interference from Pakistan nor were there any communal riots by or against Muslims when Hyderabad was integrated into India.
"Opinion among the advisers of the Government of India was not unanimous on the question of what action should be taken in regard to Hyderabad.
"The section which favoured a policy of drift had a ready excuse in the bogey of large-scale communal disorders which would follow any positive action against Hyderabad.They apprehended that in Hyderabad the Hindus would be butchered in thousands, and that there would be general slaughter of Muslims in India," Advani said, quoting from Menon's book.
Advani referred to what he called as differences between Sardar Patel and Nehru by quoting from Nair's book an instance when the Home Minister had walked out of a Cabinet meeting because of some remarks of the PM which he felt were offensive.