I don't know if that is what you're looking for but I took this from the web:
The Norman hedgerows dated back to Roman times. They were mounds of earth to keep cattle in and to mark boundaries. Typically there was only one entry into the small field enclosed by the hedgerows, which were irregular in length as well as height and set at odd angles. On the sunken roads the brush often met overhead, giving the GIs a feeling of being trapped in a leafy tunnel. Wherever they looked the view was blocked by walls of vegetation.
Undertaking an offensive in the hedgerows was risky, costly, time-consuming, fraught with frustration. It was like fighting in a maze. Platoons found themselves completely lost a few minutes after launching an attack. Squads got separated. Just as often, two platoons from the same company could occupy adjacent fields for hours before discovering each other's presence. The small fields limited deployment possibilities; seldom during the first week of battle did a unit as large as a company go into an attack intact.
Where the Americans got lost, the Germans were at home. The 352nd Division had been in Normandy for months, training for this battle. Further, the Germans were geniuses at utilizing the fortification possibilities of the hedgerows. In the early days of the battle, many GIs were killed or wounded because they dashed through the opening into a field, just the kind of aggressive tactics they had been taught, only to be cut down by pre-sited machine-gun fire or mortars (mortars caused three quarters of American casualties in Normandy).