April 22
Added the WWII header, and updated alphabetical listing.
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*[[1915]] – [[World War I]]: The use of [[poison gas in World War I]] escalates when [[chlorine|chlorine gas]] is released as a [[Chemical warfare|chemical weapon]] in the [[Second Battle of Ypres]]. |
*[[1915]] – [[World War I]]: The use of [[poison gas in World War I]] escalates when [[chlorine|chlorine gas]] is released as a [[Chemical warfare|chemical weapon]] in the [[Second Battle of Ypres]]. |
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*[[1930]] – The United Kingdom, Japan and the United States sign the [[London Naval Treaty]] regulating [[submarine]] warfare and limiting [[shipbuilding]]. |
*[[1930]] – The United Kingdom, Japan and the United States sign the [[London Naval Treaty]] regulating [[submarine]] warfare and limiting [[shipbuilding]]. |
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*[[1944]] – The [[1st Air Commando Group]] using [[Sikorsky R-4]] helicopters stage the first use of helicopters in [[military helicopter|combat]] with [[combat search and rescue]] operations in the [[China Burma India Theater]]. |
*[[1944]] – [[World War II]]: The [[1st Air Commando Group]] using [[Sikorsky R-4]] helicopters stage the first use of helicopters in [[military helicopter|combat]] with [[combat search and rescue]] operations in the [[China Burma India Theater]]. |
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*1944 – World War II: In [[Greenland in World War II|Greenland]], the Allied Sledge Patrol attack the German ''Bassgeiger'' [[North Atlantic weather war|weather station]].{{Cite book|title=War North of 80: The Last German Arctic Weather Station of World War II|last=Dege|first=Wilhelm|year=2004}} |
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* 1944 – [[World War II]]: [[Operation Persecution]] is initiated: [[Allies of World War II|Allied]] forces land in the [[Jayapura|Hollandia]] (currently known as Jayapura) area of [[New Guinea]]. |
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* 1944 – World War II: |
* 1944 – World War II: [[Operation Persecution]] is initiated: [[Allies of World War II|Allied]] forces land in the [[Jayapura|Hollandia]] (currently known as Jayapura) area of [[New Guinea]]. |
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*[[1945]] – World War II: Prisoners at the [[Jasenovac concentration camp]] revolt. Five hundred twenty are killed and around eighty escape. |
*[[1945]] – World War II: Prisoners at the [[Jasenovac concentration camp]] revolt. Five hundred twenty are killed and around eighty escape. |
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* 1945 – World War II: [[Sachsenhausen concentration camp]] is liberated by soldiers of the [[Red Army]] and [[Polish First Army]].{{Cite web|title=Sachsenhausen (Oranienburg): History & Overview|url=https://www.jewishvirtuallibrary.org/history-and-overview-of-sachsenhausen-oranienburg-concentration-camp|access-date=2022-09-27|website=jewishvirtuallibrary.org|publisher=[[Jewish Virtual Library]]}} |
* 1945 – World War II: [[Sachsenhausen concentration camp]] is liberated by soldiers of the [[Red Army]] and [[Polish First Army]].{{Cite web|title=Sachsenhausen (Oranienburg): History & Overview|url=https://www.jewishvirtuallibrary.org/history-and-overview-of-sachsenhausen-oranienburg-concentration-camp|access-date=2022-09-27|website=jewishvirtuallibrary.org|publisher=[[Jewish Virtual Library]]}} |
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