The engagement on Little Osage River or Mine Creek KS,

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It was a battle and one of the largest mounted cavalry engagements of the Civil War...

Battle of Mine Creek - Wikipedia

en.wikipedia.org

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The Confederate line was defended by an estimated 7,000 men.[7][8]

Combined, Philips' and Benteen's brigades numbered about 2,500[11] to 2,600 men.[7] Despite being outnumbered, the Union commanders decided to attack the Confederate line. One of the driving factors behind the decision to attack was Benteen's belief that the Confederates had made an error in the emplacement of their artillery.[12] The Confederate cannons were placed close to the front line, and would only have the chance to fire one or two rounds before a cavalry charge could reach them.[13]

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Confederate casualties are estimated to have numbered around 1,200.[19][8] Union losses were around 100[8] to 110.[19] Shelby's division returned in time to provide a rear guard for the defeated Confederates. Price's surviving wagons would be again be delayed late on the 25th, this time at the crossing of the Marmaton River. After a short fight at the Battle of Marmiton River, Price decided to destroy all of the wagons that did not contain essential military supplies. The retreating Confederates were again defeated at the Second Battle of Newtonia on October 28. After the defeat at Newtonia, Price's army began to fall to pieces, and was pursued by Curtis' army all the way to the Arkansas River. By December, the shattered remainder of Price's army reached Texas, with the campaign having ended in a decisive defeat. The defeat of Price's expedition marked the last major Confederate operation in the Trans-Mississippi Theater. Mine Creek gained the distinction of being one the largest battles between mounted cavalry in the war.

 

[5fish]

Here is the take on the battle...

Mine Creek Battle - October 25, 1864 - Kansapedia - Kansas Historical Society

Kansas Historical Society

www.kshs.org

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The field was wet and muddy from the previous night’s rain, and hundreds of horses and wagons had trampled the ground. In spite of the precarious conditions, both sides quickly moved into position at 10:30 a.m. Confederate artillery opened fire first, followed by the Union.

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The Union troops were armed with shorter breech-loading carbines, which were loaded at the rear of the barrel and hastened the rearming process. Union troops could fire multiple times while the Confederates were reloading. Many Confederates fired one shot then turned their horses and fled. Others stayed and used their rifles as clubs when the two forces, still astride their horses, clashed in fierce hand-to-hand combat.

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By 11:30 a.m. the Confederates were in full retreat. When they arrived at the creek the crossings were in chaos. The four-to-five feet high creek bank was slippery and crumbling from the recent rain, and the rushing water was deep. Hundreds of wagon wheels and horses had churned the mud into mires. The creek was congested with supply wagons—some still attempting to cross, others overturned or disabled and stuck in the mud. The Confederate cavalrymen were caught between the wagons and the pursuing Union forces. To avoid capture many Confederates bypassed the crossings and plunged their horses down the steep bank into the water. But capture was not entirely avoidable, and Union troops rounded up many prisoners.