The six bloodiest weeks of the civil war were called the wilderness campaign.
The Wilderness Campaign was also known as the Overland Campaign. It was battles that were fought in Virginia and it took place from May to June 1864. It was the six bloodiest weeks of the civil war.
The Seven Days Battles were the battles that took place from the 25th of June 25 to the 1st of July, 1862.
The Battle of Fort Sumter was when the South Carolina militia bombarded Fort Sumter. It took place from April 12th to the 13th of April.
In conclusion, the six bloodiest weeks of the civil war were called the wilderness campaign.