A lie which DiogenesLamp well knows but repeats endlessly anyway.
In fact, Lincoln's order to his commanders was the same as he directly told SC Governor Pickens: no first use of force.
Confederates fired first to seize Fort Sumter, resulting in six Union casualties (7%), two of whom died.
The Union seven percent casualty rate is equivalent, for example, to British losses at the Battle of Yorktown, 1781.
You very much wish it were a lie, but as I have also pointed out endlessly, every member of Lincoln's cabinet except one said Lincoln's actions in sending that war fleet was going to cause a war.
Major Anderson immediately realized it was going to cause a war when he heard of the plan. The decision to go to war was Lincoln's, and everyone around him at the time clearly understood this.