Who had more aggressive military strategy, the union or the confederacy? How was I more aggressive?

The Union strategy to win the war did not emerge all at once. ... Without its capital, the Confederacy's command lines would be disrupted. ... More than two- thirds of the casualties of these battles were Union soldiers. Most of the fighting during the American Civil War took place on Southern soil. In part, this was the result of the war strategies of both sides. To win the war, the South had only to survive. On the other hand, for the North to win, the Union had to be restored. The Union originally wanted to reunite the country, but after the Emancipation Proclamation of 1863, the Union goal changed to include the abolition of slavery. The Confederacy had the same goal throughout the war: to incorporate all slave states and secede from the Union, survive, and defend its territory.