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![View of Rotterdam after German bombing during the Western Campaign in May 1940. [LCID: 51422]](https://encyclopedia.ushmm.org/images/large/0827e6c6-7b30-4a3f-9a06-fa7d9ec14d21.jpg "View of Rotterdam after German bombing during the Western Campaign in May 1940. [LCID: 51422]")
![German troops parade through Warsaw after the invasion of Poland. [LCID: 80487]](https://encyclopedia.ushmm.org/images/large/effe57cb-94e6-4852-a506-e8a464a63fea.jpg "German troops parade through Warsaw after the invasion of Poland. [LCID: 80487]")
![Units of a German armored division on the eastern front in February 1944. [LCID: 09575]](https://encyclopedia.ushmm.org/images/large/d6d8b704-efb4-4159-b80b-c28ee41eef0e.jpg "Units of a German armored division on the eastern front in February 1944. [LCID: 09575]")
![British troops land on the beaches of Normandy on D-Day, the beginning of the Allied invasion of France to establish a second front ... [LCID: 04733]](https://encyclopedia.ushmm.org/images/large/74b01dd7-58d1-4608-950c-89f07953b810.jpg "British troops land on the beaches of Normandy on D-Day, the beginning of the Allied invasion of France to establish a second front ... [LCID: 04733]")
![View of Rotterdam after German bombing during the Western Campaign in May 1940. [LCID: 51422]](https://encyclopedia.ushmm.org/images/thumb/d8cbb347-05fe-45a3-8dc6-502d05faa4d5.jpg)