Syrian and Turkish armies opened fire on each other today for the first time since Ankara began its incursion against the Kurds. Artillery and machine-gun fire was exchanged near the village of Assadiya, south of the border town of Ras al-Ain, the Britain-based Syrian Observatory for Human Rights said. Six Syrian soldiers were killed, according to the war monitor. President Bashar al-Assad had bolstered Kurdish strongholds in northern Syria after Turkey's Recep Tayyip Erdogan began his offensive on October 9 to establish a 75-mile wide, 20-mile deep buffer zone.