BEIRUT, International Herald Tribune The anniversary this year of “April 13” – the spark that started Lebanon’s civil war – is like no other. Three decades after a gun attack on a bus triggered the 15-year sectarian conflict, Lebanon is once again in the throes of violence and political turmoil, after 15 years of relative calm and rebuilding. Still, this anniversary for the first time is characterized by Christian-Muslim unity and by the imminent dawning of an era when Lebanon will be free of foreign armies. Syria has pledged to withdraw its army by April 30, in compliance with UN and U.S. demands. Ending Syria’s 29-year dominance of Lebanon would have been unthinkable a few months ago. It came only after weeks of anti-Syrian protests and international pressure brought after the Feb. 14 assassination of former Prime Minister Rafik Hariri. sraeli forces withdrew from southern Lebanon in 2000, and most Palestinian guerrillas – key players early in the civil war – also have left. The remaining gunmen are largely confined to refugee camps with their light weapons. In 1975, in contrast, they were running a separate state within Lebanon.