Henry Halleck

Henry Wager Halleck (January 16, 1815 – January 9, 1872) was a senior United States Army officer, scholar, and lawyer. A noted expert in military studies, he was known by a nickname that became derogatory: "Old Brains". He was an important participant in the admission of California as a state and became a successful lawyer and land developer. Halleck served as the General-in-Chief of the Armies of the United States from 1862 to 1864, and then became Chief of Staff for the remainder of the war when Ulysses S. Grant was appointed to that position.

Early in the American Civil War, Halleck was a senior Union Army commander in the Western Theater. He commanded operations in the West from 1861 until 1862, during which time, while the Union armies in the East were repeatedly defeated and held back, the troops under Halleck's command won many important victories. However, Halleck was not present at those battles, and his subordinates earned most of the recognition. The only operation in which Halleck exercised field command was the so-called siege of Corinth in the spring of 1862, a Union victory which he conducted with unnecessary caution, which allowed the Confederate force to escape. Halleck also developed rivalries with several of his subordinate generals, such as Grant and Don Carlos Buell. In July 1862, following Major General George B. McClellan's failed Peninsula Campaign in the Eastern Theater, Halleck was promoted to general-in-chief. Halleck served in this capacity for about a year and a half.

Halleck was a cautious general who believed strongly in thorough preparations for battle and in the value of defensive fortifications over quick, aggressive action. He was a master of administration, logistics, and the politics necessary at the top of the military hierarchy, but exerted little effective control over field operations from his post in Washington, D.C. As general-in-chief he refused to give orders to his subordinate commanders, instead offering advice, but leaving the final decisions up to the generals in the field. As a result, his subordinates frequently criticized him and often ignored his instructions. Still, Halleck's earlier contributions to military theory are credited with encouraging a new spirit of professionalism in the army.

In March 1864, Grant was promoted to general-in-chief, locating his headquarters with the Army of the Potomac in the field, while Halleck was relegated to serving as chief of staff in Washington, providing the necessary administrative support to fulfill Grant's orders to the various armies. Without the pressure of having to control the movements of the armies, Halleck performed capably in this task, ensuring that the Union armies were as well-equipped and supplied as possible. Provided by Wikipedia