20th Iowa Volunteer Infantry Regiment

Service

• 2nd Brigade, 2nd Division, Army of the Frontier, Dept. of Missouri, to June, 1863.
• 1st Brigade, Herron's Division, 13th Army Corps, Dept. of Tennessee, to July, 1863.
• 1st Brigade, 2nd Division, 13th Army Corps, Dept. of Tennessee, to August, 1863, and Dept. of the Gulf to October, 1863.
• 2nd Brigade, 2nd Division, 13th Corps, Dept. of the Gulf, to January, 1864.
• 2nd Brigade, 4th Division, 13th Corps, to February, 1864.
• 2nd Brigade, 2nd Division, 13th Corps, to June, 1864.
• 1st Brigade, United States Forces, Texas, Dept. of the Gulf, to August, 1864.
• United States Forces, Mobile Bay, Dept. of the Gulf, to September, 1864.
• 1st Brigade, 3rd Division, 19th Corps, Dept. of the Gulf, to December, 1864.
• 4th Brigade, Reserve Corps, Military Division West Mississippi, to February, 1865.
• 3rd Brigade, 2nd Division, Reserve Corps, February, 1865.
• 3rd Brigade, 2nd Division, 13th Army Corps, Military Division West Mississippi, to July, 1865.

• Schofield's Campaign in Southwest Missouri October, 1862 to January, 1863.
• Occupation of Newtonia October 4.
• Battle of Prairie Grove, Ark., December 7.
• March over Boston Mountains to Van Buren, Ark., December 27–31.
• March to Huntsville, Ark., January 2–18, 1863, to Elk Creek January 22-February 15, and to St. Louis, arriving April 24.
• Guard Arsenal until May 15.
• At Pilot Knob until June 3.
• Moved to St. Genevieve June 3, and to Vicksburg, Miss., June 6–14.
• Siege of Vicksburg June 14-July 4.
• Expedition to Yazoo City July 12–22.
• Capture of Yazoo City July 14.
• Moved to Port Hudson July 24 and to Carrollton, La., August 16.
• Expedition to Morganza, September 5–12.
• Atchafalaya River September 9–10.
• Sterlings Plantation September 29.
• At Morganza until October 10, then moved to Carrollton.
• Expedition to Rio Grande, Texas, October 27-December 2.
• Brazos, Santiago, November 4.
• Point Isabel November 6.
• Duty at Brownsville, Point Isabel and Mustang Island until June 24, 1864.
• Moved to Brazos Santiago, thence to Brownsville, and duty there until August 2.
• Moved to New Orleans, thence to Mobile May August 2–7.
• Siege of Fort Morgan August 9–23. Capture of Fort Morgan September 23.
• Moved to Morganza September 7–12, thence to Duvet's Bluff, Ark., October 12, and duty there and at Brownsville until January, 1865.
• Moved to New Orleans January 28, thence to Barrancas, Fla., February 17.
• Campaign against Mobile and its Defenses March and April.
• Steele's march from Pensacola, Fla., to Blakely, Ala., March 20-April 2.
• Occupation of Canoe Station March 27.
• Siege of Fort Blakely April 2–9. Assault and capture of Fort Blakely April 9.
• Moved to Mobile April 14, and duty there until July.

Total strength and casualties

Commanders

• Colonel William McEntyre Dye
• Brevet Colonel Joseph Bloomfield Leake