 They fought at the Battles of Mudki and Ferozeshah in December 1845 and the Battle of Sobraon in February 1846.Ferozeshah became celebrated as a regimental anniversary on 21 December thereafter, and is still marked by the successor 3rd Battalion Mercian Regiment.Stationed in Lahore from 1846 until 1852, in that year it fought in the Second Anglo-Burmese War which saw the East India company annex the province of Pegu.