LEBANON: Blows for the P.L.O.

The heaviest tank and artillery action of Lebanon's long-playing 18-month civil war reverberated last week through the steep mountain ranges northeast of Beirut. And as has more and more been the case in the country's so far insoluble struggle, the principal combatants were not even Lebanese. The battle was mainly between Palestinian commandos holding some towns near Lebanon's 8,500-ft. Sannin Mountain and Syrian forces determined to dislodge them, with Lebanese forces fighting in secondary roles. The Syrians, after a 36-hour artillery barrage, were successful; altogether, however, another 1,500 people were killed or...