Ahom–Mughal conflicts refer to the period between the first Mughal attack on the Ahom kingdom in 1615 and the final Battle of Itakhuli in 1682. The intervening period saw the fluctuating fortunes of both powers and the end of the rule of Koch Hajo. It ended with the Ahom influence extended to the Manas river which remained the western boundary of the kingdom till the advent of the British in 1826.
From the beginning the relationship between the Ahoms and the Mughals was hostile and that was due to certain factors, such as, Mughal alliance with Koch Bihar, the western enemy of the Ahoms and secondly the growing advance of the Mughals in north-eastern frontier which alarmed them. While the Mughals supported Lakshminarayan, son of Nara Narayan of Koch Behar, the Ahom king Sukhaamphaa (1552–1603) entered into alliance by marrying the daughter of Lakshminarayan’s cousin Raghudeva, the son of Chilarai who became the ruler of the eastern part of the kingdom, Koch Hajo which included the modern districts of Goalpara, Barpeta, Kamrup, Darrang and a part of Sonitpur (up to Bharali). This dynastic alliance between Ahom and Koch was renewed afterwards by the next Ahom king Susenghphaa (Pratap Singha, 1603-1641) who married a daughter of Raja Parikshit. It is true that with a view to satisfy the territorial ambitions of his own nephew, Nar Narayan allowed partition of his kingdom. But unfortunately, in spite of being pacified, Raghudeva and his successors remained all along hostile towards the Koch royal house and this rivalry and antagonism between these two frontier states invited intervention and aggression of their two mighty neighbourhood powers: the Mughals on the west and Ahoms on the east.