They soon became involved in the Battle of Port Moresby , taking heavy losses .
They soon were relieved by the Bell P - 39 Airacobras of the US 35th and 36th Fighter Squadrons on 30 April .
They soon became involved in the Battle of Port Moresby , taking heavy losses , and were relieved by the Bell P - 39 Airacobras of the US 35th and 36th Fighter Squadrons on 30 April .