behind Egyptian lines, though half the helicopters got lost and never found the battlefield, while others were unable to land due to mortar fire. Those that successfully landed on target destroyed Egyptian artillery and ammunition dumps and separated gun crews from their batteries, sowing enough confusion to significantly reduce Egyptian artillery fire. Egyptian reinforcements from Jabal Libni advanced towards Um-Katef to counterattack but failed to reach their objective, being subjected to heavy air attacks and encountering Israeli lodgements on the roads. Egyptian commanders then called in artillery attacks on their own positions. The Israelis accomplished and sometimes exceeded their overall plan, and had largely succeeded by the following day. The Egyptians suffered about 2,000 casualties, while the Israelis lost 42 dead and 140 wounded. Yoffe's attack allowed Sharon to complete the capture of the Um-Katef, after fierce fighting. The main thrust at Um-Katef was stalled due to mines and craters. After IDF engineers had cleared a path by 4:00 pm, Israeli and Egyptian tanks engaged in fierce combat, often at ranges as close as ten yards. The battle ended in an Israeli victory, with 40 Egyptian and 19 Israeli tanks destroyed. Meanwhile, Israeli infantry finished clearing out the Egyptian trenches, with Israeli casualties standing at 14 dead and 41 wounded and Egyptian casualties at 300 dead and 100 taken prisoner. Other Israeli forces Further south, on 5 June, the 8th Armored Brigade under Colonel Albert Mandler, initially positioned as a ruse to draw off Egyptian forces from the real invasion routes, attacked the fortified bunkers at Kuntilla, a strategically valuable position whose capture would enable Mandler to block reinforcements from reaching Um-Katef and to join Sharon's upcoming attack on Nakhl. The defending Egyptian battalion outnumbered and outgunned, fiercely resisted the attack, hitting a number of Israeli tanks. Most of the defenders were killed, and only three Egyptian tanks, one of them damaged, survived. By nightfall, Mandler's forces had taken Kuntilla. With the exceptions of Rafah and Khan Yunis, Israeli forces had initially avoided entering the Gaza Strip. Israeli Defense Minister Moshe Dayan had expressly forbidden entry into the area. After Palestinian positions in Gaza opened fire on the Negev settlements of Nirim and Kissufim, IDF Chief of Staff Yitzhak Rabin overrode Dayan's instructions and ordered the 11th Mechanized Brigade under Colonel Yehuda Reshef to enter the Strip. The force was immediately met with heavy artillery fire and fierce resistance from