Conversation so far:
which side was maryland on in the civil war
During the months leading up to the Civil War, Maryland stood as a house divided. Although it was a slaveholding state, Maryland did not secede.
when was the first blood of the american civil war shed
On April 19, 1861, a secessionist mob in Baltimore attacks Massachusetts troops bound for Washington, D.C. Four soldiers and 12 rioters were killed.
when was the preliminary emancipation proclamation issued
On September 22, 1862, President Abraham Lincoln issued a preliminary Emancipation Proclamation

Question: when did the order take effect
Self-contained rewrite: when did president lincoln's emancipation proclamation take effect