Explanation:

• Britishers did a disaster in Afghanistan which is popularly known as The First Anglo-Afghan war.
• It was fought between the British Empire and the Emirate of Afghanistan from 1839 to 1842. 
• The apprehension of the Russian invasion of India and the attempt of the British to check it on the border of Afghanistan was the primary cause of the First Anglo-Afghan War.
• Lord Palmerston who became the foreign minister of Britain in 1830 was determined to stem Russian advance towards the East and favoured a forward policy to achieve that purpose.
• He appointed Lord Auckland particularly with a view to pursuing that policy in 1836.
• Lord Bentinck's successor Lord Auckland, choose a residence on the northern eastern spur of the Shimla range which was known as the Auckland House.
• Auckland was living in the Auckland House in Shimla in 1838.
• It was the venue where Shimla Manifesto declaring war against the Afghan was signed on October 1st, 1838.