How did the strategy of the North compare to that of the South during the Civil War?

Both the North and South originally employed a defensive strategy but, realizing
it would turn into a stalemate, the North switched to offensive methods.

The North utilized a defensive strategy in creating a blockade to prevent
invasion, while the South used an offensive strategy by sacking Northern cities.

Both the North and South developed an offensive strategy in which they took
turns invading and attempting to hold cities in the opponent's territory.

The North developed an offensive strategy by entering Southern territory, while
the South maintained a defensive plan by holding their ground.