during the 1967 six day war he served as a commander of an elite reconnaissance battalion making raids across enemy lines , in 1969 he was wounded during an airborne raid on a plo camp in jordan and throughout the 1970s he fought the plo in lebanon - becoming , in 1976 , the first israeli military officer to enter beirut when he slipped into the country from a missile boat to help build up the lebanese christian phalange militia , then fighting the plo on the streets of beirut .