The correct option is 2 and 3 only.
Explanation
The Battle of Chinhat was a significant engagement during the Indian Rebellion of 1857, fought near Lucknow. It marked a major setback for the British administration in Awadh and precipitated the Siege of the Lucknow Residency.
Statement 1 is Incorrect: Lord Dalhousie served as the Governor-General of India from 1848 to 1856 and had left the country before the revolt began. The British forces at the Battle of Chinhat were led by Sir Henry Lawrence, who was the Chief Commissioner of Oudh at the time.
Statement 2 is Correct: The rebel forces in the Awadh region were mobilized by prominent leaders, including Maulvi Ahmadullah Shah (the Maulvi of Faizabad). He was a key figure in the resistance against the British in Awadh. While Barkat Ahmad was the tactical commander of the sepoy regiments on the field, Maulvi Ahmadullah Shah is widely recognized as a principal leader of the insurgent forces in this theater of the war.
Statement 3 is Correct: The battle resulted in a decisive victory for the rebel forces. The British troops, heavily outnumbered and outmaneuvered, suffered significant casualties and were forced to retreat in disorder to the Lucknow Residency. This victory allowed the rebels to lay siege to the Residency.
Key Takeaway: The Battle of Chinhat (June 1857) was a major British defeat led by Sir Henry Lawrence, which directly led to the commencement of the Siege of Lucknow.