The Battle of Guadalcanal was a major turning point in WWII. In August 1942, US and Australian troops landed on Guadalcanal to seize a key airfield from Japanese forces. They were able to take the Japanese by surprise. Both sides fought fiercely over the next several months to control the strategically important island. Though the environment made fighting difficult, the Allies proved more capable of reinforcing their troops. By January 1943, American numbers had grown too large, forcing the remaining Japanese troops to evacuate and giving the Allies control of Guadalcanal.