His special field was LIFE and Charactor of Muhammad Sallallahu Alaihi wasallam.
He has written many books on Seerat including
RAHMAT E ALAM
(After first page here only part having Usul of Dawah of Nabi S.A.W is pasted.)
For downloading full book Click the link http://islamicbookslibrary.wordpress.com/2011/12/22/maulana-ilyas-kandhelvi-aur-unki-deeni-dawat-by-shaykh-syed-abul-hasan-ali-nadvi-r-a/
For rest part of article on Islamic history of Dawah success and failure principle by syed sulaiman nadvi click herehttp://tablighijamaattruth.blogspot.in/2012/04/islamic-history-of-dawahsuccess-and.html