Struggle on 'Zig-Zag Pass'
Nagayoshi had decided to make a stand in the rugged Zambales mountains at the northern base of the Bataan peninsula, which the Americans named 'Zig-Zag Pass'. Abundance in supplies and ammunition had him prepared for a long battle, but his main defensive lines were stretched thin, at 2,000 yards, which left his position vulnerable to flanking maneuvers. Nonetheless, Nagayoshi and his 39th Infantry Regiment intended to hold out indefinitely. 'Zig-Zag Pass' was described thus:
few pieces of ground combined to the same degree to roughness and dense jungle. The main road, Route 7 twists violently through the pass, following a line of least terrain resistance that wild pigs must originally have established. The jungle flora in the region is so thick that one can step five yards off the highway and not be able to see the road. The Japanese had honey-combed every hill and knoll at the Zig-Zag with foxholes linked by tunnels or trenches; at particularly advantageous Points they had constructed strong points centered on log or dirt pillboxes. All the defenses were well camouflaged, for rich, jungle foliage covered most positions, indicating that many had been prepared with great care and had been constructed well.
In effect, a small force could hold off an entire army from this position indefinitely.
On 31 January 1945, driving west of Olongapo, the 38th Division advanced east on the intricate maze of enemy fortifications in 'Zig-Zag Pass', at the same time seeking out both Japanese flanks. But on the morning of 1 February, after about three miles (5 km) of steady progress, the 152nd Regiment ran into Japanese strongpoints at 'Horseshoe Bend', the first known major 'Zig-Zag Pass' obstacles. In two days of heavy fighting, resulting in high casualties for the regiment, all eastward progress had stopped. The unfavorable, twisting terrain, communications difficulties in the thick jungle, and relocation of battalions to try to find the main line of resistance, along with a determined defense by the Japanese, all contributed to difficulty in correctly identifying all units of the 152nd at times with respect to their exact locations. The northwest to southeast line of Japanese defenses, definitively unknown at the time, also contributed to the confusion. With his offensive effectively stalled, Maj. Gen. Jones relieved the 152nd's regimental commander.
The 34th RCT was then ordered to resume the unsuccessful eastward offensive of the 152nd on 'Zig-Zag Pass'. However, after six days of severe fighting, despite heavy supporting artillery barrages and napalm bombing runs by the United States Army Air Forces (USAAF), the 34th RCT sustained heavy casualties, its offensive bogged down, barring any further progress. Gen. Jones then directed the 152nd to resume the attack on the Japanese to the north of Route 7, while on 6 February, the 151st Regiment rejoined the battle to relieve the disengaging 34th RCT. But further confusion and frustration on the pass reigned and on day's end, Maj. Gen. Hall relieved Maj. Gen. Jones of command and replaced him with Brigadier General William C. Chase.
On the day Brig. Gen. Chase assumed command, the 149th Infantry Regiment completed its eastward march north of Route 7 and linked up with XIV Corps. It then turned westward astride Route 7 to link up with the rest of the 38th Division. In tandem, the 151st and 152nd Regiments began making progress eastward through the pass. Gradually, the Japanese were pushed back and eventually overrun on 8 February. Three days later, on 11 February, the 151st was withdrawn for another mission; while the 152nd continued the offensive, and by 14 February 1945, the 149th and 152nd Regiments finally linked up.
After mopping up operations against scattered small pockets of resistance, 'Zig-Zag Pass' was securely in the hands of the 38th Division. As a testament to the ferocity of the struggle, XI Corps killed about 2,400 of the 2,800-man Japanese force while taking only 25 prisoners.
Landings at Southern Bataan
By 15 February, two 38th Division task forces under XI Corps were employed for the southern Bataan amphibious landings. One, the South Force commanded personally by Brig. Gen. Chase, consisted of the 151st Infantry Regiment reinforced by a battalion of the 34th RCT, the 139th Field Artillery Battalion, and other attached elements. The other, the East Force, consisted of the reinforced 1st Infantry Regiment of the 6th Infantry Division, was attached to the 38th Division for the mission. Brig. Gen. William Spence, the 38th Division Artillery commander, led the force.
On 11 February, the South Force sailed south off the west coast north of Bataan, spent the night of 14 February at sea, and went ashore at 10:00 on 15 February at Mariveles Harbor. LVTs from the 727th Amphibian Tractor Battalion carried the 151st Infantry Regiment ashore from the LSTs that were offshore nearly five miles (8 km), then provided covering fire from their .50 Cal and .30 Cal machine guns as they landed at Mariveles. Bullet-pierced American World War I type steel helmets were found that had been there for three years, along with the whitened remains of American soldiers that the Japanese had not buried. From Mariveles the force split, part moving up the west coast toward Bagac, the other part moving up the east coast toward Pilar.
Meanwhile, the East Force moved on 12 February from Dinalupihan south toward Pilar. It was soon augmented by elements of the 149th Infantry Regiment. At Pilar the force split, part continuing south past the town, and part turning west astride Route 111. On 18 February the two forces linked up near Bagac. A final major engagement occurred during the night of 15 February, and mopping up operations continued throughout the peninsula for about another week. Finally, on 21 February, after three years, Bataan was again secure in American and Filipino hands.
Charles P. Hall 
Rikichi Tsukada 
