twelve Lebanon had, crossed into Israeli airspace and began strafing Israeli positions in the Galilee. They were intercepted by Israeli fighter jets, and one was shot down. On the evening of 5 June, the Israeli Air Force attacked Syrian airfields. The Syrian Air Force lost some 32 MiG 21s, 23 MiG-15 and MiG-17 fighters, and two Ilyushin Il-28 bombers, two-thirds of its fighting strength. The Syrian aircraft that survived the attack retreated to distant bases and played no further role in the war. Following the attack, Syria realised that the news it had received from Egypt of the near-total destruction of the Israeli military could not have been true. On 6 June, a minor Syrian force tried to capture the water plants at Tel Dan (the subject of a fierce escalation two years earlier), Dan, and She'ar Yashuv. These attacks were repulsed with the loss of twenty soldiers and seven tanks. An Israeli officer was also killed. But a broader Syrian offensive quickly failed. Syrian reserve units were broken up by Israeli air attacks, and several tanks were reported to have sunk in the Jordan River. Other problems included tanks being too wide for bridges, lack of radio communications between tanks and infantry, and units ignoring orders to advance. A post-war Syrian army report concluded: Our forces did not go on the offensive either because they did not arrive or were not wholly prepared or because they could not find shelter from the enemy's aircraft. The reserves could not withstand the air attacks; they dispersed after their morale plummeted. The Syrians bombarded Israeli civilian settlements in the Galilee Panhandle with two battalions of M-46 130mm guns, four companies of heavy mortars, and dug-in Panzer IV tanks. The Syrian bombardment killed two civilians and hit 205 houses as well as farming installations. An inaccurate report from a Syrian officer, however, said that as a result of the bombardment that "the enemy appears to have suffered heavy losses and is retreating". Israelis debate whether the Golan Heights should be attacked On 7 and 8 June, the Israeli leadership debated about whether to attack the Golan Heights as well. Syria had supported pre-war raids that had helped raise tensions and had routinely shelled Israel from the Heights, so some Israeli leaders wanted to see Syria punished. Military opinion was that the attack would be extremely costly since it would entail an uphill battle