Nevertheless, the Allied campaign was hampered by the poor intelligence available, which included antiquated maps, unfamiliarity with the terrain, and limited aerial photography. Senior military commanders including MacArthur and Blamey were unaware of the extraordinarily difficult terrain and the extreme conditions in which the battles would be fought, and orders given to the commanders were sometimes unrealistic given the conditions on the ground. In the end though, the strategy used against the Japanese in Papua—widely criticised at the time—led to an eventual, though costly, victory. The American official historian Samuel Milner judged that "the only result, strategically speaking" of the Kokoda track campaign and subsequent fighting in Papua "was that after six months of bitter fighting and some 8,500 casualties, including 3,000 dead, the South West Pacific Area was exactly where it would have been the previous July had it been able to secure the beachhead before the Japanese got there". More recently, Australian historian Nicholas Anderson has concluded that while the Kokoda Track was a significant Allied victory, it was less important to the outcome of the Pacific War than the defeat of the main Japanese effort at this time during the Guadalcanal Campaign.