 If it had, there was a possibility that the Japanese could have driven the invasion force into the sea.On 5 April, the 184th Infantry Regiment encountered typically fierce Japanese opposition at a rocky pinnacle located about 1,000 yards southwest of Arakachi (later dubbed "The Pinnacle").A few days after the landing, the 184th came into contact with elements of the Japanese 32d Army on the heavily fortified Kakazu Ridge.