The 1971 Indo-Pak war dealt a crushing blow to Pakistani military morale and the establishment. India helped in the creation of Bangladesh from what was called East Pakistan. This video shows the troops of Brigadier Baqir Siddiqui, Chief of Staff, Eastern Command of Pakistan Army surrendering before Indian Army Major General Gandharv Nagra on December 21, 1971.
Though the war officially ended on December 16, this surrender was also a very significant event involving 12,000 Pakistani troops.
By the end of the war, Pakistan had lost half its navy, a quarter of its air force and a third of its army.