Of interest a Russian connection to the campaign,related in Edward Drea's Japan's Imperial Army,page 229,on why the understrength Ichiki Detachment was sent in,in August 1942:
The high command took the American landing lightly owing partly to its assumption that a major Allied counteroffensive would not begin until late 1943 and partly to faulty intelligence.After the battle of Savo Island,fought in the early hours of August 9,naval reconnaissance pilots reported that the American fleet had vanished and the island seemed deserted.A few days later,the Soviet naval attache in Tokyo reportedly told informants that the US objective was a reconnaissance-in-force to destroy the airfield and he expected an imminent withdrawal...Ichiki believed...he [only] faced a small enemy reconnaissance unit..