In 1857 the Indian Mutiny began and the regiment, like many other Indian units, remained loyal to the British. During the British-Indian siege of rebel-held Delhi (begun on 30 May) the 1st Punjab Infantry was part of the 3rd Column, commanded by Col. Campbell. On 14 September the column was tasked with storming the Kashmiri Gate—a part of the walled defences of Delhi—which they successfully achieved. Fierce fighting, however, ensued and Delhi was not fully retaken until 20 September. The rebellion was finally quelled by July 1858.