A Dynamical Theory of the Electromagnetic Field
Dec 8 James Clerk Maxwell's paper "A Dynamical Theory of the Electromagnetic Field" is 1st read by the Royal Society in London (published by the Royal Society 1865)
- Dec 8 Pope Pius IX publishes encyclical Quanta cura ("Syllabus errorum")
Clifton Suspension Bridge,
Dec 8 The Clifton Suspension Bridge, designed by Isambard Kingdom Brunel, is finally opened in Bristol, England, 5 years after his death
Sherman Begins Siege of Savannah
Dec 10 General Sherman's armies reach Savannah & 12 day siege begins
- Dec 13 Battle of Fort McAllister, Georgia
Paraguay Declares War On Brazil
Dec 13 War of the Triple Alliance: Paraguay officially declares war on Brazil, invades the next day
- Dec 14 War of the Triple Alliance: Paraguay invades the Brazilian province of Mato Grosso
- Dec 15 Battle of Nashville, Tennessee: Union forces under General George Thomas shatters General John Bell Hood's Confederate Army of Tennessee
- Dec 15 Raid on Stoneman: Abingdon & Glade Springs, Virginia
- Dec 16 Battle of Nashville ends after 4400 causalities
- Dec 20 -Dec 27th] Battle of Ft Fisher, NC
- Dec 21 US Union General Sherman captures Savannah, Georgia, which surrenders to him, at the end of his March To the Sea Campaign
- Dec 24 Battle of Gordonsville, Virginia
- Dec 28 Battle of Egypt Station, Mississippi
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