When Shah Jahan fell ill, a struggle for the throne started between his four sons - Dara Shikoh, Shah Shuja, Aurangzeb and Murad Baksh. Shuja immediately crowned himself the emperor and took imperial titles, November 1657.
He marched with a large army, backed by a good number of war-boats in the river Ganges. However, he was beaten by Dara's army in a hotly contested Battle of Bahadurpur near Banares (in modern Uttar Pradesh, India). Shuja turned back to Rajmahal to make further preparations. He signed a treaty with his elder brother Dara, which left him in control of Bengal, Orissa and a large part of Bihar, 17 May 1658.
The battle of Dharmat was fought between his sons Dara Shikoh (the eldest son and heir apparent) and his two younger brothers Aurangzeb and Murad Baksh (third and fourth sons of Shah Jahan).
Battle of Samugarh, Jang-e-Samugarh, (May 29, 1658), was a decisive battle in the struggle for the throne during the Mughal war of succession (1658–1659) between the sons of the Mughal Emperor Shah Jahan after the emperor's serious illness in September 1657.