Twenty-seventh Infantry.  Col., Silas Colgrove; Lieut.-Cols. 
Archibald T. Harrison, Abisha L. Morrison, John R. Fesler; 
Majs., John Mehringer, William S. Johnson, George W. Burge, 
Theodore F. Colgrove

This regiment was organized at Indianapolis in Aug. 1861, and 
was mustered in Sept. 12.  It left the state Sept. 15, for 
Washington City where it was transferred to Banks' Army of the 
Shenandoah in October.

It was in winter quarters near Frederick City, Md., and joined 
the movement in Shenandoah Valley in March, 1862, marching 
into Winchester on the 9th and after the battle of March 22-
23, joined in pursuit of Jackson's army.  It was in the 
battles of Front Royal and Winchester in May, holding back a 
vastly superior force for nearly 4 hours, after which it fell 
back with the army and engaged the enemy in the public 
streets.

It became part of Banks' division of Pope's Army of Virginia 
at Culpeper Court House and with that command participated in 
the battle of Cedar Mountain.  It then took part in the 
Maryland campaign and was actively engaged at Antietam, where 
it lost heavily.  It was then placed on picket duty, on the 
east bank of the Potomac, from Harper's Ferry to the mouth of 
Opequan creek, and during the winter moved to the vicinity of 
Fairfax Station, where it remained until spring.

It participated in the battle of Chancellorsville, losing 
heavily, and in pursuit of Lee's invading army marched with 
the 12th corps through Maryland into Pennsylvania, reaching 
Gettysburg in time to take a prominent part in that battle, 
and in the resistance to Pickett's charge on July 3, suffering 
heavy loss.

It then joined in the pursuit of the retreating army to the 
Potomac.  In September it was transferred to the West with the 
12th corps and was stationed at Tullahoma, Tenn., during the 
fall and winter.

A portion of the regiment reenlisted on Jan. 24, 1864, and 
after their return from furlough, it joined Sherman in 
Georgia, participating in the battle of Resaca, where, on an 
open field, it defeated the 32nd and 38th Ala., inflicting 
heavy loss and taking the battle flag, colonel and 100 
prisoners of the 38th.  Its own loss was 68 killed and 
wounded.

It participated in all the marching and skirmishing, battles and 
assaults of the army in the Atlanta campaign, moving to the city 
at its conclusion.  The non-veterans were mustered out Nov. 4, 
1864, the veterans and remaining recruits being transferred to 
the 70th regiment, and serving with it through the campaign to 
Savannah and up through the Carolinas.

On the muster-out of the regiment they were transferred to the 
33rd, with which they served until its muster out at 
Louisville, July 21, 1865.  The original strength was 1,052; 
gain by recruits, 116; reenlistments, 154; total, 1,322.  Loss 
by death, 275; desertion, 47; unaccounted for, 52.

Source: The Union Army, vol. 3