Battles
Normandy: The Landing, the Bocage and the Breakout
The Normandy landings are among the most thoroughly documented military operations in history, and the familiar account stops at the end of the first day. The assault was one problem. The campaign that followed was a different and in some respects harder one, and it took nearly two months.
Why the landing was the smaller problem
The assault itself was a logistics and engineering achievement more than a tactical one. The difficulties that had to be solved in advance were: getting a force across open water in weather that had to be predicted several days out; landing it across beaches with obstacles, mines and defended exits; and then supplying it over the same beaches for weeks before a port could be taken and repaired.
The solutions were substantially industrial. Purpose-built landing craft in large numbers. Prefabricated harbours towed across the Channel. Specialised armoured vehicles for clearing obstacles, crossing soft ground and breaching walls. A deception effort that kept significant German forces oriented toward a different stretch of coast for weeks after the landing.
Casualties on the day varied enormously by sector (from very light to severe) depending on the defences encountered and how much of the supporting fire arrived where it was needed. The variation is the interesting part: the plan was uniform, and the results were not.
The bocage
Inland from the beaches lay the terrain that decided the timetable. Norman field boundaries are earth banks, built up over centuries, two to four metres high, topped with dense growth, frequently with a sunken lane running behind them. Fields are small.
Militarily, every bank is a prepared defensive position. It provides concealment, cover from direct fire, and observation across the open field in front. A platoon holding one bank forces a deliberate attack; when it falls, there is an identical position eighty metres further on. Armour could not climb the banks without rearing up and exposing its thin belly plate, and could not manoeuvre off the lanes.
The consequence was that a force with overwhelming superiority in artillery, air support and materiel advanced at a few hundred metres a day, at a cost per field that would have been unthinkable in open country. The improvised solution (welded steel prongs on tank hulls to cut through the banks rather than climb them) is a well-known piece of field engineering and it arrived weeks into the campaign.
Two sectors, two different battles
The eastern sector became a grinding series of attacks around the city that anchored it, against the bulk of the German armoured reserve. Those attacks are frequently described as failures because they did not take their objectives on schedule, and that reading misses their function: they drew and held the armour.
The western sector, in worse terrain, ground forward toward the base of the peninsula and the port at its tip. Progress was slow and costly, and it eventually produced a frontage from which a concentrated attack could be launched.
The breakout
At the end of July a narrow-front attack supported by extremely heavy air bombardment opened a gap in the western sector. Armoured forces passed through it into terrain that was open enough for movement, and the campaign changed character within days — from metres per day to tens of kilometres.
The two halves are causally connected, and the connection is the point. The attrition in the east held the armour that would otherwise have sealed the western gap. A campaign that looks like seven weeks of failure followed by a sudden success was one operation, and the first part paid for the second.
The landings are remembered as a single day and were planned as a logistics problem measured in months. Getting ashore was the part that could fail in hours; staying ashore depended on artificial harbours, fuel lines and a build-up rate that had to outpace the defender’s ability to reinforce.
Questions and answers
Why were five separate landing beaches used?
Because a single beach could not take the volume of men and materiel required, and because concentrating on one sector would have concentrated the defence against it. Five sectors spread the assault across a frontage wide enough to prevent a single reserve formation from containing it, and each was allocated to a specific national force with its own follow-up shipping and objectives inland.
What made the bocage so difficult?
Centuries of field boundaries had produced earth banks two to four metres high, topped with dense growth and often with a sunken lane behind. Each bank is a ready-made defensive position with concealment, cover from fire and a clear view of the field in front. Fields were small, so a force clearing one immediately faced another identical problem eighty metres on, and armour could not cross the banks without exposing its thin belly armour.
Was the airborne operation a success?
It achieved its operational purpose and it was untidy. Drops were widely scattered by cloud, anti-aircraft fire and navigation difficulty, and many units fought the first days as improvised groups instead of as formations. The scattering also confused the defence about the scale and location of the landings, and the essential tasks (securing the flanks and the causeway exits) were accomplished. Both statements are standard in the professional literature.
What finally produced the breakout?
A concentrated attack on a narrow front supported by very heavy air bombardment, launched at the end of July, which opened a gap that armoured forces then exploited into open country. The preceding seven weeks of attritional fighting had drawn German armoured reserves toward the eastern sector, which left the western sector thinner than it would otherwise have been: the breakout was the payoff of the grind, not an alternative to it.