He continued to consolidate and expand the territory of the Bengal Sultanate, which had emerged as one of the leading powers in the Indian subcontinent.
The most significant event of his reign was the second invasion of Bengal by the Sultan of Delhi Firuz Shah Tughluq in 1359.
[4] The Tughlaqs declared Zafar Khan Fars, a Persian noble and son-in-law of Fakhruddin Mubarak Shah, as the legitimate ruler of Bengal.
Firuz Shah Tughluq led an army consisting of 80,000 cavalry, a large infantry and 470 elephants to Bengal.
Known as sober and gentle, Sikandar Shah liked the association of learned persons and respected the clergy and Sufis.