Sir: Circumstances render it necessary to place in command of your ship, and for a special purpose, an officer who is duly informed and instructed in relation to the wishes of the Government, and you will therefore consider yourself detached; but in taking this step the Government does not intend in the least to reflect upon your efficiency or patriotism; on the contrary, have the fullest confidence in your ability to perform any duty required of you.
Hoping soon to be able to give you a better command than the one you now enjoy, and trusting that you will have full confidence in the disposition of the Government toward you, I remain,
Captain Samuel Mercer, U.S. Navy. ABRAHAM LINCOLN.