 The failure to identify the reorganization of the defenses was a rare intelligence breakdown for the Allies . Post @-@ action reports still documented the original estimate and assumed that the 352nd had been deployed to the coastal defenses by chance , a few days previously , as part of an anti @-@ invasion exercise . The source of this inaccurate information came from German prisoners of war from the 352nd Infantry Division captured on D @-@ Day as reported by the 16th Infantry S @-@ 3 D @-@ Day Action Report . In fact , Allied intelligence had already become aware of the relocation of the 352nd Infantry Division on June 4 . This information was passed on to V Infantry Corps and 1st Infantry Division HQ through 1st Army , but at that late stage in the operations , no plans were changed . 
