A quick foot note, but in Belgium and France, about 17 people die each year from ordnance left over from WW I .And thants just the explosive shells (Mostly farm workers), then there´s the gas grenades, and the mines. We had a motorway worker die over here last year after his machine hit a bomb that the EOD had missed when laying the motorway 20 or 30 years ago, it was just under the surface, and he was planing the surface prior to laying a new one. How it didn´t explode with all the cars and trucks going over it I don´t know.