why did a mob of southern sympathizers attack northern troops in April of 1861 in Maryland shortly after the war begun

the baltimore area did not want to fight in the war and were anti war

Explanation:

In 1861, most Baltimoreans were anti-war and did not support a violent conflict with their southern neighbors,[citation needed] but many sympathized passionately with the Southern cause. In the previous year's presidential election, Abraham Lincoln had received only 1,100 of more than 30,000 votes cast in the city.