They were held under house arrest in Fort McHenry and forbidden to vote on secession.
That makes them officially neutral.
If you are neutral with a gun to your head, does that count?
State sentiment was actively Southern, street riots in Baltimore where business people threw rocks and bricks at invading northern militias, railroad bridges burned, and able bodied men leaving home to join up with the Virginia Regiments or the First MD Volunteers (Confederate Artillery unit), all despite the lack of ability of the legislature to act.
The couplet from the State Song "Avenge the patriotic gore/That flecked the streets of Baltimore" refers to the riots: the State Song Maryland My Maryland was written by an expat Marylander during the war while in Louisiana.
While thoroughly occupied by Union forces, the sentiment was still strongly Southern.
Actually, I have a friend whose ancestor joined almost all his town in fighting for the Union. They were from some place downstate; I don’t remember where. But definitely Union people.
Here in NC, Marylanders are considered in-betweeners, like people from the Far West. Sure, a lot of them fought for the North, but where do the modern people like Westerners fit in? Does it even matter? I don’t think so.
/My sister is the child of a Southerner and an immigrant from Scandinavia. She was born in California, and has spent most of her life in Arizona. She considers herself Southern.
Does it matter? I think not.
//My wife was born in Cuba, was naturalized at the age of fifteen, and considers herself a Star Trek nerd. Does it matter?
///Only 1%’ers profit from keeping us at each others’ throats like this. That matters.