the military strategy of the north was fourfold:to blockade southern ports to cut off supplies from Europe, to break the confederacy in two at the Mississippi River, to destroy the transportation and communication systems of the confederacy thus crippling morale and to attack the confederate capital at Richmond.
The souths strategy was to take advantage of their compact geography, with internal lines of communication, their military heritage (Southerners had been disproportionately the officers of the United States Army), and their greater enthusiasm for their cause to wear down the Union will to wage war.
An example of a primary source is George Washington’s diary. Another primary source would be a letter written home by a soldier in the Revolutionary War. Another example of a primary source is Einstein’s lab notes.