center of Confederate support. The ex-
tent of Baltimore’s sympathy to the
Confederate cause had become clear
on April 19, when the 6th Massachu-
setts militia—a Union regiment under
the command of Benjamin Butler
(1818–1893) that was traveling to
Washington, D.C.—came under attack
in the city from a secessionist mob. By
the time the clash ended, dozens of
injured people and dead bodies lit-
tered the city’s streets.
The Union eventually gained
control of Baltimore and the rest of
Maryland, but Lincoln was forced to
establish martial law to do so. Martial
law is a situation in which military
forces take over the responsibility of
administering and enforcing laws in a
city or region from civilian lawmakers.
Moreover, the president suspended a
piece of the Constitution known as
the writ of habeas corpus in Maryland
in order to quiet anti-Union voices.
The writ of habeas corpus was de-
signed to protect Americans from
being arrested and held in custody on
unreasonable charges or without
being charged with a crime. But Lin-
coln had decided that it would be very
difficult to control Maryland if the
state’s secessionist movement was not
neutralized.
Ignoring protests from a wide
range of people, including U.S.
Supreme Court chief justice Roger
Taney (1777–1864), Lincoln took ad-
vantage of his suspension of habeas
corpus to silence secessionists all
around the state. Over the course of
several weeks, Federal officials arrested
for its military. Finally, military leaders
on both sides recognized that Vir-
ginia’s decision to stand under the
Confederate flag posed a great threat
to the Union because the state was lo-
cated right next to Washington, D.C.,
the Union’s capital.
The Union fights to keep
other border states
After losing Virginia, Arkansas,
Tennessee, and North Carolina to the
Confederacy, Lincoln turned his atten-
tion to four border slave states—
Delaware, Maryland, Kentucky, and
Missouri—that had not yet an-
nounced their support for North or
South. Lincoln was certain that
Delaware would remain loyal to the
Union, but he knew that Confederate
sympathies were strong in the other
three states.
Determined to prevent any
other states from joining the Confed-
eracy, Lincoln took drastic measures in
both Maryland and Missouri. Keeping
Maryland in Union hands was particu-
larly important because it was situated
north of Washington, D.C. This meant
that if the state joined the Confedera-
cy, then the U.S. capital would be cut
off from the rest of the Union and
would almost certainly fall to the Con-
federate Army. With these considera-
tions in mind, Lincoln acted swiftly.
Lincoln silences Maryland
secessionists
First, Lincoln decided to clamp
down on secessionist activities in Bal-
timore, a big city that had become a
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