Portal:Military of the United States/Selected anniversaries/April 22
- 1863 - American Civil War: Grierson's Raid begins – troops under Union Colonel Benjamin Grierson attack central Mississippi.
- 1898 - Spanish–American War: The United States Navy begins a blockade of Cuban ports and the USS Nashville captures a Spanish merchant ship.
- 1930 - The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
- 1944 - World War II: Operation Persecution initiated – Allied forces land in the Hollandia (currently known as Jayapura) area of New Guinea.
- 1972 - Vietnam War: Increased American bombing in Vietnam prompts antiwar protests in New York City, San Francisco,, and Los Angeles.