Anyone know how long it took the federals to construct the fortress at Murfreesboro and how long it took confederates to construct the works on the Tullahoma sector. I wonder what the weather conditions were like.
The massive construction operation that resulted in the fortress complex that secured Nashville took about six months. Fort Grainger in Franklin was the western corner of a triangle about 45 miles on a side. 15 miles eastward, The Works at Triune are made up of 3 miles of earthworks around a ridge top that dominates the skyline. Fortress Rosecrans, the largest earthen fortress in North America, is another 15 miles. Ten miles from Rosecrans & Murfreesboro was Fort Transit on top of Pilot Knob near Readyville. The Ft Transit signal station was 60' up an enormous tree. It marked the eastern corner of the base of the triangle. From atop the Knob, in the evening, aircraft landing lights at Nashville International 40 miles away can be clearly made out. On cold, clear nights it was possible to signal directly to Fort Negley in Nashville with turpentine torches. Nashville was one of the most fortified places on earth.
To accomplish the movement of an almost inconceivable number of cubic yards of dirt. Soldiers who had joined up to get out of hard farm work were deeply annoyed when assigned to digging the sticky Tennessee clay.
72,000 slaves lived in the counties surrounding Nashville in 1860. Initially, slaves were requisitioned along with wheel barrows, tools & six days rations. The owner was paid for the work. In short order, self liberated individuals were recruited (none too gently in some cases) to do the work. Working for wages was a seismic cultural change. After the Emancipation Proclamation, these work groups became the core of USCT regiments that fought in the Battle of Nashville.
While tens of square miles of timber were being cut to feed the saw mills in Fortress Rosecrans around Murfreesboro, 20 miles south work gangs of slaves & Army of Tennessee soldiers dug miles CB of works. All the trees for roughly a quarter mile in front of the earthworks were cut to form a vast abatis. About 25 miles southward, an elaborate series of earthworks was excavated at Tullahoma. Works also blocked Hoover's Gap, one of the three entries up onto the Highland Plateau. (Today I-24 & HWY 41 pass through the gap.) Another hilltop was denuded to block Liberty Gap.
Bragg's cunning plan that could not fail was to fall back into the Tullahoma works & decimate the Army of the Cumberlander's banzai charges. Rosecrans knew everything there was to know about withstanding banzai charges. He never ordered a single one.
In June 1863 when the Army of the C advanced along a 50 mile front. Only a 500 year rain event saved Bragg from being surrounded in his Tullahoma stronghold. In danger of being cut off, Bragg ordered a precipitant retreat. Wondering Cumberlanders entered the Tullahoma works & feasted on Bragg's rations. Row upon row of brand new spotless white tents stood slashed to ribbons by disgusted Rebels. Not a single shot had been fired from behind the laboriously constructed workers.
At Shelbyville, Wheeler's troopers, armed with muzzleloaders attempted to hold off Minty's Saber battalion armed with breechloaders & Spencer Repeaters. Pennsylvania cavalry infiltrated the vast abatis & took Wheeler in the flank. The elaborate monument to futility fell in a matter of minutes. At Shelbyville Wheeler suffered one of the most lopsided drubbings of the war.
Even Hood was not demented enough to directly assault the works at Fortress Rosecrans & Nashville. They did their work by intimidating any attacker into impotence.
As to the weather… winter to spring in Middle Tennessee is a buffet of weather conditions. Swings of seventy degrees in a day or two are par for the course.
Note:
Today, Fort Negley in Nashville is the only intact element of the vast Nashville complex. An impressive curtain wall & redoubts from Fortress Rosecrans is part of Stones River NB. The works at Triune are like Mayan ruins a mile along a wide ridge. The stone faced star bastion at the highest point is very impressive. Several hundred yards of the Shelbyville works were discovered on private property not long ago. Well preserved Fort Grainger & a remarkable signal station redoubt are preserved by parks in Franklin.