The Six Day War between Arab countries and Israel , the Prague Spring and subsequent Soviet invasion of Czechoslovakia , and the Indo-Pakistani War of 1971 leading to the birth of Bangladesh all took place during his tenure as secretary-general .
The Six Day War between Arab countries and Israel , the Prague Spring and subsequent Soviet invasion of Czechoslovakia , and the Indo-Pakistani War of 1971 leading to the birth of Bangladesh all took place during his time as Secretary-General .