The Treaty of Gandamak officially ended the first phase of the Second Anglo-Afghan War. Afghanistan ceded various frontier areas to Britain to prevent invasion of further areas of the country. It was signed on 26May 1879 by King Mohammad Yaqub Khan of Afghanistan and Sir Pierre Louis Napoleon Cavagnari of British's Government of India at a British army camp near the village of Gandamak, about east of Kabul. The treaty was ratified by Lord Edward Robert Bulwer Lytton, Viceroy of India, on 30 May 1879.