21 fighters from the elite
Student battalion (later known as the al-Jarmaq Battalion) of the
Fatah movement were deployed inside the castle, under the command of Ya'qoub Abdel-Hafiz Sumour (nom de guerre "Rasim"). The fighters were divided into three squads of seven members each. The squads were deployed left, right and centre in the lower sections of the castle. The positions were well dug in with covered trenches and concrete firing positions. The battle started with a heavy Israeli artillery and aircraft bombardment. The main IDF force in the central sector advanced from the border over
Tayibe and
Qantara and crossed the Litani river at the Qa'qa'iya bridge. Well over the bridge, the force split into three parts: one continued to the coast over
Doueir and
Zefta, the second surrounded the town of
Nabatiye and the third proceeded to the Beaufort castle. The force heading for Beaufort consisted of 65 men from the Golani engineering company and 23 men from the Golani commando unit. They were travelling in 20
APCs, accompanied by a platoon of tanks. The attack had originally been planned as a daylight attack, but due to congested roads in south Lebanon at the time and repeated breakdowns of the tanks, the force did not arrive in highlands west of the Beaufort until 4 PM. None of the tanks managed to arrive at the location. The plans had to be changed to a night attack, without any support from the tanks. The engineering company, under Lt.Col. Barkai, was to take the southern outpost with its bunkers while the Golani commandos, under Moshe Kaplinsky, were to take the northern outpost and its trenches. It was decided that the Golani engineers would take the lead and the commandos would follow. The engineers charged up the hill of the fortress and managed to slip through without casualties. They attacked the Palestinian positions and managed to conquer the antenna position. One soldier was killed and several were wounded. The commandos, however, were cut down by heavy machine gun fire on their way to the top. Of the original 21 fighters, only seven or eight managed to reach their destination. Two soldiers were killed and four wounded. The rest were taking cover halfway. Led by Mordechai Goldman, the force began a second assault, killing several Palestinians. They were later joined by Harnik and two of his soldiers. They were facing the main bunker, where a Palestinian fighter, entrenched in a concrete position, was firing his machine gun. The Palestinian managed to kill Harnik with a bullet to the chest before Goldman threw an explosive charge at his position, killing the Palestinian fighter and destroying the position. Most of the remaining Palestinians were killed as Israeli troops secured the mountain. Because of both weather conditions and continued firing nearby, medical evacuation of the Israeli wounded was delayed until shortly before daybreak. Only then, did the Israeli death toll - six men, including the unit commander - become apparent. After it, the soldiers spread out and climbed to take the roof of the fortress, which turned out to be deserted. By 6:30 AM, Israeli control over the castle was secured. According to Mu'in at-Tahir, the commander of the Fatah
Students' battalion (who personally did not take part in the battle inside the castle), some of the fighters managed to escape from the castle. At ten in the evening, units from the Students’ battalion, positioned outside the castle, attacked IDF tanks stationed to the west of the castle with rockets. In the turmoil, a handful of fighters managed to sneak out. Some of them were killed in other battles during the Lebanon war, but three of the Fatah fighters from the battle of the Beaufort castle survived the war. ==Aftermath==