Just before D Day we (the allies) bombed all along the French coast to destroy roads, railway lines, bridges etc.
We did not want to alert the Germans that we were going to land at Normandy so we bombed all along the coast, including many places we had no intention of landing.
This killed many French people and destroyed many towns and villages.
Was this a war crime?
I am afraid in war nasty things happen, it is the nature of things.
I am sure the Germans and Japs committed far worse "war crimes" than the allies.
Just before D Day we bombed a French town with Germans in it, and the Germans were so annoyed they took out over 90 prisoners (mostly French Resistance) from the local jail and shot them in cold blood.
Just after D Day the Germans went to a nearby village and massacred over 600 innocent people from that village. The village is still there as it was afte the massacre, empty.
http://www.oradour.info/
Don't feel sorry for the Germans.