西元（以下同）1949年8月15日，東南軍政長官公署成立，9月1日陳誠接任東南軍政長官，肩負東南諸省軍事防務，鑒於金門防務空虛而共軍又虎視眈眈，即於10月初向胡璉徵調第12兵團高魁元的第18軍馳援。10月17日，廈門淪陷，共軍進犯金門迫在眉睫，陳誠緊急令正航往舟山群島第12兵團第19軍轉往金門，並且派胡璉趕赴金門指揮。另外，陳誠亦令東南軍政長官公署技術總隊支援金門戰事，在沿岸布置地雷、炸藥，防堵共軍侵入。10月25日凌晨2點，共軍夜襲金門，船隻誤觸地雷受損嚴重，技術總隊陸續以炸藥破壞船隻，阻斷共軍的後援補給。共軍儘管突破金門防禦工事，力抗國軍反擊，但在陳誠部署下仍寡不敵眾。金門駐軍與援軍團結一致，澈底殲滅共軍，不僅扭轉國共戰爭以降頹勢，軍心士氣更為之大振。

On August 15, 1949, the Southeast Military and Political Executive Office was established. On September 1, Chen Cheng took over the lead of the office, shouldering the military defense of the southeastern provinces. Considering the CCP’s eyeing on the emptiness of defense, the 18th Army of Gao Kuiyuan of the 12th Corps was levied at the beginning of October. The 18th Army of Gao Kuiyuan belongs to Hu Lien. On October 17, Xiamen had fallen, the CCP’s attack on Kinmen was imminent. Chen Cheng ordered the 19th Army of the 12th Corps to transfer to Kinmen Island. On the other hand, he ordered the Technical Corps of the Southeast Military and Political Executive Office to support the Kinmen Battle, deploying mines and explosives throughout the coast to prevent enemy landing. At 2 o'clock on the morning of October 25, the CCP attacked Kinmen Island. Their ships were seriously damaged by the accidental touch of mines. Although the Communists broke through the fortress, they were still outnumbered. The Kinmen garrison and the reinforcements united and completely wiped out the enemy.