In April 1863, Union forces of the Indian Home Guard under Colonel William A. Phillips occupied Fort Gibson in Indian Territory. Upon learning that there were no reports of Confederate activity in the surrounding area, Phillips made the tactical decision to send the fort's livestock out to graze. This move proved costly when a Union sentry failed to scout a mountain road, allowing Confederate forces to descend on the grazing animals and seize them. This engagement arose directly from the vulnerability created by Phillips's decision to disperse the fort's resources in what he believed to be a secure environment.
When the Confederates attacked to capture the livestock, Colonel Phillips responded by dispatching his available mounted forces to retake the animals, which succeeded in recovering most of them. However, the Confederates launched a strong counterattack against the Union sortie, driving the mounted forces back and nearly surrounding two companies. Recognizing the danger, Colonel Phillips personally led infantry forces accompanied by an artillery battery from the fort to reinforce the mounted units already engaged. The combined Union force succeeded in halting the Confederate assault. The Confederates briefly held their position in a forest but were subsequently routed and forced to withdraw beyond the Arkansas River. Phillips then sent his cavalry in pursuit of the retreating Confederate forces.
The battle demonstrated the effectiveness of Phillips's personal leadership and the coordinated use of mounted and infantry forces with artillery support. The Union forces successfully repelled the Confederate attack and drove them back across the Arkansas River, maintaining control of Fort Gibson and preventing the loss of the fort's livestock and supplies.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
Combined several hundred in various engagements
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