What did the north call the battle of Manassas?

the Battle of Bull Run?

Right.

Yankee newspapers always got it wrong.

Here is news from what they called the Battle of Bull Run, as they saw it.

http://www.sonofthesouth.net/leefoundation/civil-war/1861/august/news-bull-run.htm

The North referred to the battle of Manassas as the "First Battle of Bull Run".