While the 112th and 7th Cavalry Regiments were busily engaged in defending the east flank of the 32d Division in its push south along Highway 2, the 12th Cavalry was mopping up enemy groups entrenched in the mountains farther to the east. Particularly strong enemy resistance had been encountered in the Mt. Badian and Hill 2348 sector, which was about five miles northeast of Kananga, a barrio on Highway 2.[44] In the process of reducing the Japanese-held area, it was estimated that an enemy force of 500 to 600 men had been wiped out. From 28 November to 9 December, the 12th Cavalry remained in the Mt. Badian and Hill 2348 sector, sent out westward patrols, and slowly moved westward.

On 10 December, General Sibert decided to have elements of the 1st Cavalry Division debouch from the mountains onto Highway 2 south of the 32d Division and in the Lonoy area. This move was to be concurrent with the expected advance of the 32d Division down the highway.[45] The 1st Squadron, 12th Cavalry, was in the vicinity of Mt. Cabungaan, and the 2d Squadron, on Hill 2348, was 2,000 yards northeast of the 1st Squadron. An enemy strong point existed to the north of the perimeter of the 1st Squadron. The 12th Cavalry spent 10 December in making preparations for a two-squadron assault against this enemy force. The plan was for the 1st Squadron to attack at 0830 while the 2d Squadron from Hill 2348 supported the attack by enveloping the left flank of the enemy. In furtherance of this plan Troop E of the 2d Squadron moved off Hill 2348 at 0800 toward the southwest and dug in for the night just north of Mt. Cabungaan.[46]

On the morning of 11 December, an intense mortar and artillery concentration was placed upon the enemy position in front of the 1st Squadron. The fire was so close that fragments frequently fell on the waiting assault troops. After this fire, the 1st Squadron with Troop A in the lead moved out at 0715. At the same time Troop E attacked from the northeast. The enemy defenses consisted of seven or eight pillboxes and many caves dug into the very rugged terrain. The men of Troop A, closely followed by Troop B, charged up the hill “throwing grenades and firing from the hip.”[47] The hill fell to the 1st Squadron at 1003 after very heavy hand-to-hand fighting. Troop E had been held up by the terrain and was unable to assist the 1st Squadron. After the capture of the Japanese position, patrols established contact with Troop E at 1200. The regimental reconnaissance platoon returned from the vicinity of Lonoy with the information that the Japanese had prepared strong defensive positions in that area. The platoon had gained a good observation point 900 yards east of Lonoy.[48] The next several days were spent in sending out patrols and moving the 2d Squadron to the position of the 1st Squadron.

On 14 December, the 12th Cavalry was ordered to continue west to Highway 2 and assist the advance of the 32d Division, to establish a roadblock on the highway, and to attack the hostile forces to the north between it and the 32d Division.[49] In furtherance of this order, the 1st Squadron, less A and C Troops, moved west on 15 December toward a previously reconnoitered area that was about 1,800 yards east of the barrio of Lonoy. This site, a banana plantation, was chosen for its observation facilities to the west and as an excellent dropping ground for supplies. The 1st Squadron, having encountered little opposition, closed on the area before dusk. Thereupon the rest of the regiment was ordered to close in on the area before nightfall on 17 December.

Lonoy

The 12th Cavalry on 18 December sent out patrols to Lonoy, Kananga, and to the northwest to make contact with the nearest friendly troops. The patrols to Lonoy and Kananga, although they ran into scattered groups of the enemy, were able to locate suitable approaches to Lonoy for their squadrons.[50]

At 2235, on 18 December, the 12th Cavalry received orders to move out the following morning, seize Lonoy, and be prepared to seize Kananga. The commanding officer of the regiment decided to have the 1st and 2d Squadrons move out abreast with the 2d Squadron on the left. During the entire night the artillery was to deliver harassing fire on the highway north of Lonoy and on the area between the routes of approach of the two squadrons.

After a preparation on 19 December, the 1st and 2d Squadrons moved out at 0800. The 1st Squadron met only light, sporadic resistance. The troops observed many Japanese proceeding north along the highway and had mortar and artillery fires placed upon them. At 1200, the 1st Squadron seized Lonoy, captured much enemy equipment, and destroyed many supply dumps. The 1st Squadron moved to assist the 2d Squadron in the capture of a knoll southeast of the barrio. The 1st Squadron closed on the knoll about 1400, and aided the assault of the 2d Squadron by fire and by sending a troop east to assist it.

The 2d Squadron jumped off on schedule but at 0930, when it was 800 yards short of its objective, the squadron came under heavy rifle and machine gun fire from the thick woods. The 271st Field Artillery Battalion placed fire on the area and a great many of the enemy were killed, the remainder fleeing south. The squadron received additional machine gun fire from the north but a patrol quickly silenced it. In the meantime the mortar platoon from Troop D, in support of the 1st Squadron, fired upon Lonoy. The Japanese immediately responded with fire from a 105-mm. gun, which they had cleverly concealed in the gap between the two squadrons and about 600 yards from the regimental observation post at which the gun directed its fire. The enemy gun killed one man and wounded fifteen others of the command-post group. The heavy machine guns from the Weapons troop and the artillery from the 271st Field Artillery Battalion began concentrating their fires upon the enemy gun. The Antitank Platoon was sent out to destroy the gun and its crew. Following the machine gun and artillery fire, the enemy gun was silent for about half an hour. It then suddenly opened up against the 2d Squadron at a range of about 300 yards. The enemy fire resulted in tree bursts which killed five men and wounded fifteen others. Troop G, which suffered the most casualties, and the Antitank Platoon immediately turned and attacked to the north to destroy the gun. The 2d Squadron, less Troop G, renewed the attack towards Lonoy, receiving scattered rifle fire. At 1730 it reached Lonoy and was in contact with the 1st Squadron.

Meanwhile, Troop G sideslipped to the west and with the Antitank Platoon attacked and destroyed the enemy gun and four of its crew. A patrol located another enemy 105-mm. gun but, because of darkness and point-blank fire from the weapon at a range of about twenty-five feet, it was unable to knock out the gun. At 2200 Troops G and H, the medical group, and the Antitank Platoon formed a joint night perimeter.[51]