Keith D. Dickson

American Civil War For Dummies


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The regiment had 10 companies of 100 men each for an official strength of 1,000. A colonel commanded the regiment. A lieutenant colonel (second in command), a major (third in command), and a small staff (which took care of the administrative needs of the regiment) assisted the colonel. Four regiments formed a brigade, commanded by a brigadier (obviously) general. This makes an official total of 4,000 men. Three brigades made up a division, commanded by either a brigadier or major (not so obviously) general. This makes an official total of 12,000 men. Three divisions made up a corps (pronounced “core”), commanded by a major general (if a Union division) or a lieutenant general (if a Confederate division). This works out to an official total of 36,000 men. See Table 4-1 for a comprehensive reference of army structure. See Table 4-2 for army hierarchy.

Unit Unit Multiples Number of Soldiers
Company 100
Regiment 10 Companies 1,000
Brigade 4 Regiments 4,000
Division 3 Brigades 12,000
Corps 3 Divisions 36,000
Unit Commanding Officer
Regiment Colonel Lieutenant or Colonel Major
Brigade Brigadier General
Division Brigadier General or Major General
Corps Major General or Lieutenant General

      Strength and size of units

      The official numbers are good to get an idea of structure and organization, but in reality, Civil War armies had wide variances in unit strength. Sickness, desertions, battle deaths, wounds, and furloughs (time off from military duty, usually to go home) took their inevitable toll. Regiments often were 500 men or below. By 1863, some veteran regiments in both armies were down to 200 men or fewer. The reason for this lies in the method by which regiments were initially recruited and organized. Volunteers filled the initial ranks of new regiments. After several months of combat, the original (and now understrength) volunteer regiments were rarely brought back up to original strength with other volunteers; instead, entirely new regiments of recruits or conscripts (individuals enrolled in the army by compulsion through law) would be added to the army. This was especially true for Union units. Needless to say, this caused tremendous organizational and administrative headaches for a division or corps commander. This situation also caused problems on the battlefield. Veteran units had to be assigned to divisions composed of mostly untested recruits. This practice kept the overall fighting quality of the Union army uneven. After the institution of conscription (compulsory military service), replacements for both Union and Confederate armies were brought into existing units to bring them up to nominal strength. As the war went on, brigades filled out their strength by adding a number of understrength but very combat-capable regiments. Near the end of the war a brigade contained anywhere from five to six regiments.

      UNION AND CONFEDERATE CAVALRY: A COMPARISON

      Roles of different units in an army

      In a campaign, armies and corps conduct large-scale maneuvers to gain an advantage and set the conditions for battle. Divisions are assigned objectives to attack — usually a piece of terrain (a hill, ridge, trench line, woods) occupied by an enemy force. Capturing this piece of terrain would give the attacker a significant advantage and cause the defender to be exposed to other attacks. In the defense, a division is given a stretch of ground to cover with its brigades, usually a critical piece of terrain that must be protected if the army is to survive. The division commander passes orders to his brigade commanders, who in turn pass the orders down to the colonels in the regiments. And anywhere from 400 to 1,000 men grimly take their places shoulder to shoulder on line. After all the strategy, campaigning, and maneuver, after all the generals have made their decisions, the battle is fought, and won or lost, at the regimental level.

      Cavalry regiments

      Union and Confederate cavalry regiments were organized much in the same way as infantry units, except cavalry companies were (and still are) called troops. A cavalry regiment had 12 troops. Cavalry units were considered independent and usually not deployed with infantry. Artillery batteries were attached to infantry brigades and divisions. An artillery reserve would be under control of either the corps or army commander.

      Anyone can master the principles of war. There is no secret to conducting military operations according to the principles of war. This is the knowledge base all military leaders use when employing military forces in war. But not every military leader is successful in war. The science of war alone cannot win battles — the art is what makes the difference. The mystique of warfare and its attraction, some may say, is in observing how well a military leader translates principles of war into action in real situations of life and death when the fate of the nation is at stake. A number of generals throughout history have gained immortality through their ability to take the science of warfare and translate it into something uniquely theirs, something that people call art. The American Civil War displays the talents of some of these masters of the art of war.