Fort Sumter and Karl Marx

I have been recently reading through some articles on the American Civil War written by Karl Marx and I came across something I had never heard before.

From: The North American Civil War

In a quick search I was not able to find any confirmation that the Confederates intentionally opted to avoid a peaceful surrender of the fort in preference for an act of war. In fact the only mention of the communication I found was in General Beauregard’s own reports of the incident in which he indicates that Marx is mistaken:

From: P.G.T. Beauregard’s Report of the Bombardment of Fort Sumter

I am curious if anyone has any other sources that confirm or refute Marx’s claim? Was he using misinformation to bolster his argument (intentionally or not)?

Marx’s account is not correct. The Confederates knew that Fort Sumter was about to run out of provisions (because Anderson had told them), but they also knew that a resupply expedition was under way and might arrive at any moment. President Lincoln had sent official notice of the latter to the Governor of South Carolina.

Lincoln also notified the Governor that the resupply expedition would be peaceful; it would only carry provisions and would not initiate hostilities. However, it would be backed by warships sailing outside the harbor, and if the Confederates fired upon the resupply operation, war would be on and the warships would naturally sail into the harbor and join the fight.

Beauregard quite naturally decided to reduce the fort before the resupply expedition arrived.

However, note that his account also slants the truth a little bit; to say that “the ships and fort would unite in an attack upon us” implies that the North might have fired the first shots, which was not the case (and which Beauregard knew not to be the case). However, the ships would have joined in the reply of the fort to a Confederate attack, so military logic obviously favored an immediate assault.