Question: what year did the confederates call to the union?
About the article "Assassination of Abraham Lincoln", section "Original plan: Kidnapping the president".

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After the Union defeat at New Hope Church, Sherman ordered Howard to attack Johnston's seemingly exposed right flank.
The Confederates were ready for the attack, which did not unfold as planned because supporting troops never appeared.
The Confederates repulsed the attack, causing high casualties. 
Confederate Lt. Gen. Theophilus H. Holmes's troops attacked Helena, Arkansas, in an attempt to relieve pressure on Vicksburg.
Although the Confederates had more troops and did initially capture some of the fortifications, the Union forces repelled them. 
On the morning of October 12, 1862, scouts reported to Stuart that Union Brigadier General George Stoneman was guarding the Potomac River fords near Poolesville, Maryland with several thousand men.
On the of the Potomac River from the mouth of the Monocacy River to Edwards Ferry, which is near Poolesville, at least four crossings were available.
Stuart followed the recommendation of Captain White, who was from the local area, to avoid Stoneman's likely position by using White's Ford, which was below the mouth of the Monocacy River near present day White's Ferry and little used as it was a rough crossing, to cross the Potomac to Loudon County, Virginia.
Stuart did not come into contact with Stoneman, whose men, other than a small guard unit, arrived at White's Ford too late to confront the Confederates.
His force did meet Union cavalry commanded by Brigadier General Alfred Pleasonton at the mouth of the Monocacy River near Barnesville, Maryland.
Pleasonton initially was deceived by the blue uniforms the Confederates were wearing after having acquired them during the raid.
Pleasonton ordered his men to fire when the Confederates charged from a short distance away.
Then he withdrew his men to engage in a long range rifle fire exchange with Stuart's sharpshooters and cannon.
Pleasonton was not at full strength, since he had sent many of his men toward a ford near the mouth of the Monocacy River in a mistaken guess about where Stuart was headed.
Here the Union cavalry encountered Union infantry and both paused in order to insure that the other party was not a Confederate force in Union uniforms.
Meanwhile, Confederate Brigadier General W.H.F.
Lee demanded the surrender of about 200 Union infantry blocking the way to the ford because, as he wrote to them, the Confederates were present in overwhelming force.
This and some cannon and rifle fire bluffed and forced the Union soldiers to abandon their strong position.
The Union troops did not flee completely but lingered in the vicinity awaiting possible reinforcements, who as it turned out were busy identifying each other.
The ford now was open for the Confederates to cross.
Pelham's artillery came up and kept the Union forces, including Pleasonton's men, back while Stuart's men crossed the Potomac with their 1,200 captured horses, supplies and 30 civilian hostages.
It was a close call for Stuart's rear section which had been deployed to protect the column and needed to be urged to withdraw quickly in order not to be caught by Union reinforcements.
The small Union force detailed to White's Ford, where Lee had crossed into Maryland in September, proved to be a weak link in McClellan's dispositions.
Although Union reinforcements arrived just after the last of Stuart's men crossed the Potomac, Pleasonton did not believe it would be useful to pursue the Confederates across the river.
The Confederated soon rode safely into Leesburg, Virginia with their captured horses, supplies and hostages and without having lost a man to death or a serious injury. 
The Second Battle of Corinth (which, in the context of the American Civil War, is usually referred to as the Battle of Corinth, to differentiate it from the Siege of Corinth earlier the same year) was fought October 3–4, 1862, in Corinth, Mississippi.
For the second time in the Iuka-Corinth Campaign, Union Maj. Gen. William Rosecrans defeated a Confederate army, this time one under Maj. Gen. Earl Van Dorn.
After the Battle of Iuka, Maj. Gen. Sterling Price marched his army to meet with Van Dorn's.
The combined force, under the command of the more senior Van Dorn, moved in the direction of Corinth, a critical rail junction in northern Mississippi, hoping to disrupt Union lines of communications and then sweep into Middle Tennessee.
The fighting began on October 3 as the Confederates pushed the Federal army from the rifle pits originally constructed by the Confederates for the Siege of Corinth.
The Confederates exploited a gap in the Union line and continued to press the Union troops until they fell back to an inner line of fortifications.
On the second day of battle, the Confederates moved forward to meet heavy Union artillery fire, storming Battery Powell and Battery Robinett, where desperate hand-to-hand fighting occurred.
A brief incursion into the town of Corinth was repulsed.
After a Federal counterattack recaptured Battery Powell, Van Dorn ordered a general retreat.
Rosecrans did not pursue immediately and the Confederates escaped destruction. 
With the attack on Fort Sumter on April 12, 1861, followed by President Abraham Lincoln’s April 15 call for 75,000 volunteers to put the seceded states back into line, public sentiment turned dramatically against the Union.
Historian Daniel Crofts thus reports: "Unionists of all descriptions, both those who became Confederates and those who did not, considered the proclamation calling for seventy-five thousand troops "disastrous."
Having consulted personally with Lincoln in March, Congressman Horace Maynard, the unconditional Unionist and future Republican from East Tennessee, felt assured that the administration would pursue a peaceful policy.
Soon after April 15, a dismayed Maynard reported that "the President's extraordinary proclamation" had unleashed "a tornado of excitement that seems likely to sweep us all away."
Men who had "heretofore been cool, firm and Union loving" had become "perfectly wild" and were "aroused to a frenzy of passion."
For what purpose, they asked, could such an army be wanted "but to invade, overrun and subjugate the Southern states."
The growing war spirit in the North further convinced southerners that they would have to "fight for our hearthstones and the security of home.
""  Governor Isham Harris began military mobilization, submitted an ordinance of secession to the General Assembly, and made direct overtures to the Confederate government.