MacArthur bypassed the Japanese forces at Hansa Bay and Wewak, and assaulted Hollandia and Aitape, which Willoughby reported being lightly defended based on intelligence gathered in the Battle of Sio. MacArthur's bold thrust by going 600 miles up the coast had surprised and confused the Japanese high command, who had not anticipated that MacArthur would take such risks. Although they were out of range of the Fifth Air Force's fighters based in the Ramu Valley, the timing of the operation allowed the aircraft carriers of Nimitz's Pacific Fleet to provide air support.