where did the engagement between the forces take place?
Around the Matanikau river.
Actions along the Matanikau
Japanese troop concentrations at several points around the Matanikau River. 
what is 'actions along the matanikau'? Two engagements between forces during the Guadalcanal campaign. who were the two forces? United State and forces of Imperial Japan. what was the campaign about? The United States wanted to neutralize the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign.
wiki:8595805
Actions along the Matanikau [SEP] Introduction
The Marine attacks were intended to "mop-up" Japanese stragglers retreating towards the Matanikau from the recent Battle of Edson's Ridge, to disrupt Japanese attempts to use the Matanikau area as a base for attacks on the Marine Lunga defenses, and to destroy any Japanese forces in the area. The Japanese—under the overall command of Major General Kiyotake Kawaguchi—repulsed the Marine attacks. During the action, three U.S. Marine companies were surrounded by Japanese forces, took heavy losses, and barely escaped with assistance from a U.S. Navy destroyer and landing craft manned by U.S. Coast Guard personnel.