The FUBAR factor is always present in war. Stephen E. Ambrose wrote in Citizen Soldiers: The U.S. Army in Europe from June 7, 1944 to May 8, 1945 that the planners for Operation OVERLORD looked at the terrain of Normandy and saw lots and lots of hedges.
They assumed that the hedges that dominated the Norman landscape were like the small hedges they saw in Britain. Not so; these were hedgerows, tall and forbidding hedges that had been around since the time of Caesar's conquest of Gallia. The Wehrmacht had planned to use these formidable obstacles to defend Normandy if the Allies had landed there successfully. This one mistake led to Allied forces landing in Normandy without proper means to crash through the hedgerows. Several thousand Americans were killed in June of 1944 before this problem was solved by some innovative NCO's.
No one gets war right. Ever.
What matters is who wins.
Be Seeing You,
Chris