 Land mines and unexploded ordnance continued to inflict casualties upon the Norman population following the end of the campaign.Prior to the invasion, SHAEF issued instructions (later the basis for the 1954 Hague Convention Protocol I) emphasising the need to limit the destruction to French heritage sites.These sites, named in the Official Civil Affairs Lists of Monuments, were not to be used by troops unless permission was received from the upper echelons of the chain of command.