The Capture of Atlanta.

Atlanta answers to Chicago. The rebel sympathizers at Chicago the other day resolved that we could not suppress the rebellion by force of arms, and must therefore, obtain peace by submission to the demands of the rebels. This is what the verbiage called their platform means. At the very moment that they were resolving this, Gen. Sherman's army was in motion, and the capture of Atlanta, the capital of the southern half of the rebel confederacy followed. So soon have our brave armies in Georgia, under the leadership of such War Democrats as Sherman, Logan, and Ransom sent back an indignant denial of the cowardly declarations of the Chicago platform, and rebuked its rebel sympathizing authors. The Copperheads are covered with confusion and dismay at the unexpected result. They regarded the ability of the rebels to hold Atlanta and Richmond until after the November election as two points necessary to their success and the defeat of Lincoln. They have already but one of these points, and they are in trepidation lest they shall lose the other also.

At the hour of writing (twelve o'clock Sunday night) we are yet without further details of the movement than was furnished by the dispatches of Saturday morning last. By these it seems that while the rebel cavalry were attempting to cut off General Sherman's communications in Tennessee, that wary and skillful officer was carrying out a plan by which the rebel stronghold fell into our possession with scarcely a struggle. With four of his corps he flanked the place, moving round on the west side, while his other corps fell back to the Chattahoochie bridge. Hood, induced by this movement to believe that the corps left behind had commenced a retreat, seems to have started out with nearly his whole force to look after Sherman's main army, when General Slocum steped in and seized the much coveted prize. The rebel general has been completely outgeneraled and will now be compelled to fight in the open field, if he makes a stand at all.

Gen. Sherman's main army is reported to have moved with twenty days rations. This implies that he intends a march of some distance — whether towards Macon, Andersonville (where some thirty thousand Union prisoners are confined) or in the direction of Montgomery, Ala., remains to be seen. It is probable that Macon is the point he has in view. If he has obtained possession of the line of the Macon railroad, thus preventing Hood from using if for the transportation of his troops, a very pretty race will be the result, in which the advantage of the first start will be with Gen. Sherman. In the meantime he will omit no opportunity to crush the rebel army, while the seat of war will be transferred still farther into the interior of Georgia. With Atlanta already in our possession, and Mobile, as we have reason to believe, soon to be so, the whole of Alabama and Mississippi will soon be re-claimed from rebel rule.