![Ring of steel protected Oahu from invasion but not from attack by air | Article | The United States Army Ring of steel protected Oahu from invasion but not from attack by air | Article | The United States Army](https://api.army.mil/e2/c/images/2017/08/09/488328/original.jpg)
Ring of steel protected Oahu from invasion but not from attack by air | Article | The United States Army
![The German artillery battery (Batterie allemande) near Bayeux in Normandy is a well-preserved German coastal The German artillery battery (Batterie allemande) near Bayeux in Normandy is a well-preserved German coastal](https://as1.ftcdn.net/v2/jpg/03/06/45/58/1000_F_306455812_IoPzKSPcWOEHstMfLPdqyFlVvQaRcBGk.jpg)
The German artillery battery (Batterie allemande) near Bayeux in Normandy is a well-preserved German coastal
![The 6-inch coastal defense battery, North Head, as seen by an attacking... | Download Scientific Diagram The 6-inch coastal defense battery, North Head, as seen by an attacking... | Download Scientific Diagram](https://www.researchgate.net/profile/Dirk-Spennemann/publication/316165659/figure/fig7/AS:669459555569691@1536623004711/The-6-inch-coastal-defense-battery-North-Head-Gun-B-as-photographed-on-7-September-1943_Q320.jpg)
The 6-inch coastal defense battery, North Head, as seen by an attacking... | Download Scientific Diagram
![US Marines on top of a large Japanese coastal artillery battery, Tarawa Atoll, 1943 | The Digital Collections of the National WWII Museum : Oral Histories US Marines on top of a large Japanese coastal artillery battery, Tarawa Atoll, 1943 | The Digital Collections of the National WWII Museum : Oral Histories](https://49fe30bb3aa7406c16dc-5c968119d095dc32d807923c59347cc2.ssl.cf1.rackcdn.com/2013.495.096_1.jpg)