The Japanese Defensive Position
More than 1,800 seasoned Japanese soldiers and marines, who for the most part had not participated in the Moresby drive, were entrenched in a superb defensive position awaiting our attack. The western flank of the enemy line was protected by the sea and the impenetrable swamps of the main mouth of the Girua River. The eastern flank rested on the seacoast south of Cape Endaiadere. The middle of the line was guarded by the wide stretch of continuous swamp between Entrance and Simemi creeks. Our attacks were necessarily confined to the trails, canalized along two widely separated corridors without any lateral communication, one between Simemi Creek and the east coast and the other on the west side of the swamp along the Ango trail toward the Mission and Buna Village. Movement of our troops from one flank to the other entailed a 2-day march via Ango and Simemi; in contrast, the Japanese had a motor road from the Mission to Simemi Creek over which they could reinforce either flank in a few minutes.
The Japanese main line of defense ran from the Girua River along the outskirts of Buna Village, thence roughly southeast to Entrance Creek and across it to the nearby junction of the Village trail with the Mission-Ango track. There it turned abruptly north, enclosing a narrow pointed area called the Triangle, then swept east across the grass-covered field known as Government Gardens toward Giropa Point. About 500 yards south of the Point it bent southeast to the western end of the Old Strip. This western sector was manned by two Marine units, the Yasuda Butai (detachment) and the Tsukioka Butai, under Col. Yoshitatsu Yasuda. Men of these units had fought in China, Malaya, and various islands of the Pacific.
The south edge of the Old Strip was protected by the swamp. From the bridge across Simemi Creek at the southeastern corner of the Old Strip, the enemy defense line continued along the northern edge of the New Strip through the Duropa Plantation to reach the sea a half mile south of Cape Endaiadere. The 3d Battalion, 229th Infantry,[1] which had-fought at Canton and Hongkong, marched down from Gona on 18 November and manned this eastern flank, together with a replacement unit known as the Yamamoto Butai.
- ↑ The 1st and 2d Battalions, 229th Infantry, it may be noted, were at this time on Guadalcanal.
