The most famous case of an accidental win was Antietam in September 1862, when a copy of Lee's orders was dropped in the field and taken to Union headquarters. They revealed important tactical movements, which gave McLellan the advantage.
However McLellan did not win many other battles, and certainly not by accident.
Mexico won the Thornton Affair, but the rest of the battles were won by the US.
The vikings won many battles as well as lost many battles as well, after all you cant keep winning battles only.
In the early days of the war, the South seemed to win every conflict. The blockade, the capture and control of the Mississippi and New Orleans and U.S.Grant turned the tide. While the South won more battles, the important ones went to the Yankees.
colonists won the 2 battles and the British won the third one
Both Battles of Bull Run were won by the Confederates. Shiloh and Antietam were both won by the Union.
Ulysses S. Grant.
Mexico won the Thornton Affair, but the rest of the battles were won by the US.
Most of the first or early battles of the Thirty Years' War were won by the Hapsburgs. France won the war in the end.
General Kearny.
Both of these battles were Union or Northern victories and Major General Ulysses S. Grant was the US commanding general at both of them.
union army
union army
George Washington
Ulysses S. Grant.
hector fourzan
The British because General Charles Cornwallis was forced to surrender.
Zachary Taylor.