Headquarters Army of the Potomac,
Camp near Harrison's Landing, Va.,

July 7, 1862.

Mr. President:

You have been fully informed that [the] rebel army is in [our] front, with the purpose of overwhelming us by attacking our positions or reducing us by blocking our river communications. I cannot but regard our condition as critical, and I earnestly desire, in view of possible contingencies, to lay before your excellency, for your private consideration, my general views concerning the existing state of the rebellion, although they do not strictly relate to the situation of this army or strictly come within the scope of my official duties. These views amount to convictions, and are deeply impressed upon my mind and heart. Our cause must never be abandoned; it is the cause of free institutions and self-government. The Constitution and the Union must be preserved, whatever may be the cost in time, treasure, and blood. If secession is successful other dissolutions are clearly to be seen in the future. Let neither military disaster, political faction, nor foreign war shake your settled purpose to enforce the equal operation of the laws of the United States upon the people of every state.

The time has come when the government must determine upon a civil and military policy covering the whole ground of our national trouble.

The responsibility of determining, declaring, and supporting such civil and military policy, and of directing the whole course of national affairs in regard to the rebellion, must now be assumed and exercised by you, or our cause will be lost. The Constitution gives you power sufficient even for the present terrible exigency.

This rebellion has assumed the character of war; as such it should be regarded, and it should be conducted upon the highest principles known to Christian civilization. It should not be a war looking to the subjugation of the people of any State in any event. It should not be at all a war upon population, but against armed forces and political organization. Neither confiscation of property, political executions of persons, territorial organization of States, or forcible abolition of slavery should be contemplated for a moment. In prosecuting the war all private property and unarmed persons should be strictly protected, subject only to the necessity of military operations. All private property taken for military use should be paid or receipted for; pillage and waste should be treated as high crimes; all unnecessary trespass sternly prohibited, and offensive demeanor by the military towards citizens promptly rebuked. Military arrests should not be tolerated, except in places where active hostilities exist, and oaths not required by enactments constitutionally made should be neither demanded nor received. Military government should be confined to the preservation of public order and the protection of political rights. Military power should not be allowed to interfere with the relations of servitude, either by supporting or impairing the authority of the master, except for repressing disorder, as in other cases. Slave contraband under the act of Congress, seeking military protection, should receive it. The right of the Government to appropriate permanently to its own service claims to slave labor should be asserted, and the right of the owner to compensation therefor should be recognized.

This principle might be extended, upon grounds of military necessity and security, to all the slaves within a particular State, thus working manumission in such State; and in Missouri, perhaps in Western Virginia also, and possibly even in Maryland, the expediency of such a measure is only a question of time.

A system of policy thus constitutional and conservative, and pervaded by the influences of Christianity and freedom, would receive the support of almost all truly loyal men, would deeply impress the rebel masses and all foreign nations, and it might be humbly hoped that it would commend itself to the favor of the Almighty.

Unless the principles governing the future conduct of our struggle shall be made known and approved, the effort to obtain requisite forces will be almost hopeless. A declaration of radical views, especially upon slavery, will rapidly disintegrate our present armies. The policy of the government must be supported by concentration of military power. The national forces should not be dispersed in expeditions, posts of occupation, and numerous armies, but should be mainly collected into masses and brought to bear upon the armies of the Confederate States. Those armies thoroughly defeated, the political structure which they support would soon cease to exist.

In carrying out any system of policy which you may form you will require a commander-in-chief of the army, one who possesses your confidence, understands your views and who is competent to execute your orders by directing the military forces of the nation to the accomplishment of the objects by you proposed. I do not ask that place for myself. I am willing to serve you in such position as you may assign me, and I will do as faithfully as ever subordinate served superior.

I may be on the brink of eternity; and as I hope forgiveness from my Master, I have written this letter with sincerity towards you and from love of my country.

Very respectfully, your obedient servant,
Geo. B. McClellan,
Maj.-Gen. Commanding.