From the scenario:
On the 7 August 1942 the United States Marine Corps landed on the strategic south pacific island of Guadalcanal and stopped the construction of a vital Japanese airfield. If operational this airfield would isolate Australia and New Zealand from their allies. US Forces complete the airfield and name it Henderson Field. Imperial Japanese Forces have left their base at Rabaul and are on the way to rectify this insult. Imperial soldiers begin their landings on the 18 August and immediately march towards Henderson. In their way stands a crocodile infested creek and a battalion of United States Marines. At 2000hrs on the 20 August, the battle began.