 As the Japanese regrouped west of the <unk> , the U.S. forces concentrated on shoring up and strengthening their <unk> defenses . On 14 September , <unk> moved another battalion , the 3rd Battalion , 2nd Marine Regiment ( 3 / 2 ) , from <unk> to <unk> . On 18 September , an Allied naval convoy delivered 4 @,@ 157 men from the 3rd Provisional Marine Brigade ( the U.S. 7th Marine Regiment augmented by additional support units ) to <unk> . These reinforcements allowed <unk> — beginning on 19 September — to establish an unbroken line of defense around the <unk> perimeter . <unk> 's forces ' next significant clashes with the Japanese occurred along the <unk> River from 23 – 27 September and 6 – 9 October . 
