Located inland from Torokina, on the western coast of Bougainville. Located along the Piva River. Two villages were located in this area: Piva No. 1 (to the south, closest to the coast) and Piva No. 2( further inland). The Piva Trail ran alongside the river, connecting to the 'East-West Trail' and 'Numa Numa Trail'.

After landing at Torokina on November 1, 1943 USMC Raiders counterattacked on November 8 against Japanese resistance based at Piva. Japanese flanking attempts failed against the 3rd Raider Battalion positions near Piva No. 1, and the Raiders there counterattacked on November 9. Japanese defenders in the area withdraw further inland.

After the initial battle, two airfields are constructed at Piva, and used in the campaign to neutralize Rabaul.

Piva North (Piva Bomber, Piva Yoke)
American built airfield used by USN, USMC, RAAF and RNZAF.

Piva South (Piva Fighter, Piva Uncle)
American built airfield located to the south of Piva North, used as a fighter strip.

Japanese Counter Attack
North of Piva North Airfield, the Japanese began with active probes and patrols around March 6, on the morning of March 8, 1944 Japanese artillery from Hill 250 and 600 and other locations began bombardment of the beachhead at Torokina, and Piva airstrips, concentrating on Piva instead of the forward areas of the American perimeter, preceding a three-pronged assault. Return fire from American destroyers, and the 37th division, 6th field artillery and 129th Infantry cannon company, and 56 SBDs, 36 TBF struck around Hill 1111. Several planes were destroyed at the Piva strips, tanks and a 155mm gun. One man was killed and a dozen wounded. More shelling in the evening wounded 10 more. The Japanese 6th division, commanded by General Hyakutake prepared to attack, but in early March was soundly defeated.

Iwasha Unit Attack
March 9-13. On the night of 8-9, they attacked Hill 700, but were initially beaten off.  But by daylight they had taken the hill and cut the McClelland Road, forcing supplies to be carried to the forward area by hand. The next day, the 1/145 and 2/145 counter attacked, by afternoon restoring their line.

Muda Unit Attacks
March 10-15. Attacked the American sector, near Hill 260. Lead by Col. Muda's 3d Battalion 13th Infantry. They succeeded in occupying Hill 260, overwhelming outnumbered Americans, who then counterattacked on the 12th, that failed. During the entire attack 10,000 rounds of 105mm shells were fired at the hill at the occupying Japanese, who withdrew on the 17th to join the Magata's force. The hill was finally retaken on the 19th.

Magata Unit Attack
March 11-17. 45th Regiment attacked from the logging trail on the 12, and overran the forward American line.  After failing, a five day lull to transfer additional troops, they attacked again on the 23rd, but was soon repulsed by infantry and tank counter attacks. In total, approximately 3,000 Japanese were killed, and 3,000+ wounded.  American 14th Corps lost 263 dead.