Government House and its ridge. The Jerusalem Brigade's Reserve Battalion 161, under Lieutenant-Colonel Asher Dreizin, was given the task. Dreizin had two infantry companies and eight tanks under his command, several of which broke down or became stuck in the mud at Ramat Rachel, leaving three for the assault. The Jordanians mounted fierce resistance, knocking out two tanks. The Israelis broke through the compound's western gate and began clearing the building with grenades, before General Odd Bull, commander of the UN observers, compelled the Israelis to hold their fire, telling them that the Jordanians had already fled. The Israelis proceeded to take the Antenna Hill, directly behind Government House, and clear out a series of bunkers to the west and south. The fighting often conducted hand-to-hand, continued for nearly four hours before the surviving Jordanians fell back to trenches held by the Hittin Brigade, which were steadily overwhelmed. By 6:30 am, the Jordanians had retreated to Bethlehem, having suffered about 100 casualties. All but ten of Dreizin's soldiers were casualties, and Dreizin himself was wounded three times. Israeli invasion During the late afternoon of 5 June, the Israelis launched an offensive to encircle Jerusalem, which lasted into the following day. During the night, they were supported by intense tank, artillery and mortar fire to soften up Jordanian positions. Searchlights placed atop the Labor Federation building, then the tallest in Israeli Jerusalem, exposed and blinded the Jordanians. The Jerusalem Brigade moved south of Jerusalem, while the mechanized Harel Brigade and 55th Paratroopers Brigade under Mordechai Gur encircled it from the north. A combined force of tanks and paratroopers crossed no-man's land near the Mandelbaum Gate. Gur's 66th paratroop battalion approached the fortified Police Academy. The Israelis used bangalore torpedoes to blast their way through barbed wire leading up to the position while exposed and under heavy fire. With the aid of two tanks borrowed from the Jerusalem Brigade, they captured the Police Academy. After receiving reinforcements, they moved up to attack Ammunition Hill. The Jordanian defenders, who were heavily dug-in, fiercely resisted the attack. All of the Israeli officers except for two company commanders were killed, and the fighting was mostly led by individual soldiers. The fighting was conducted at close quarters in trenches and bunkers and was often hand-to-hand. The Israelis captured the position after four hours of heavy fighting. During the battle, 36 Israeli and 71 Jordanian soldiers were