Sir: The command of the Department of the West having devolved upon you, I propose to offer you a few suggestions. Knowing how hazardous it is to bind down a distant commander in the field to specific lines and operations, as so much always depends on a knowledge of localities and passing events, it is intended, therefore, to leave a considerable margin for the exercise of your judgment and discretion. The main rebel army (Price's) west of the Mississippi is believed to have passed Dade County in full retreat upon northwestern Arkansas, leaving Missouri almost freed from the enemy, excepting in the southeast of the State. Assuming this basis of fact, it seems desirable, as you are not likely to overtake Price, and are in danger of making too long a line from your own base of supplies and reinforcements, that you should give up the pursuit halt your main army, divide it into two corps of observation, one occupying Sedalla and the other Rolla, the present termini of railroad; then recruit the condition of both corps by reestablishing and improving their discipline and instruction, perfecting their clothing and equipments, and providing less uncomfortable quarters. Of course, both railroads must be guarded and kept open, judiciously employing just so much force as is necessary for this. 'From these two points, Sedalia and Rolla, and especially in judicious cooperation with Lane on the Kansas border, it would be so easy to concentrate and repel an army of the enemy returning on Missouri from the southwest that It is not probable any such attempt to return will be made before or during the approaching cold weather. 289 Before Spring the people of Missouri will probably be in no favorable mood to renew for next year the troubles which have so much afflicted and impoverished them during this. If you adopt this line of policy, and if, as I anticipate, you will see no enemy in great force approaching, you will have a surplus of force, which you can withdraw from these points and direct to others, as may be needed, the railroads furnishing ready means of reinforcing their main points, if occasion requires. Doubtless local uprisings will for a time continue to occur, but these can be met by detachments and local forces of our own, and will ere long tire out of themselves. While, as stated in the beginning of the letter, a large discretion must be and is left with yourself, I feel sure that an indefinite pursuit of Price or an attempt by this long and circuitous route to reach Memphis will be exhaustive beyond endurance, and will end in the loss of the whole force engaged. Your obedient servant, A. LINCOLN.