With great armies now massing, it was widely thought in the North that another western battle might end the war. Grant, reinstated by Halleck at the urging of Lincoln and Secretary of War Edwin Stanton, left Fort Henry and traveled by boat up the Tennessee River to rejoin his army with orders to advance with the Army of the Tennessee into Tennessee. Grant's main army was located at Pittsburg Landing, while 40,000 Confederate troops converged at Corinth, Mississippi. Brigadier General William Tecumseh Sherman assured Grant that his green troops were ready for an attack. Grant agreed and wired Halleck with their assessment. Grant wanted to attack the Confederates at Corinth, but Halleck ordered him not to attack until Major General Don Carlos Buell arrived with his division of 25,000. Meanwhile, Grant prepared for an attack on the Confederate army of roughly equal strength. Instead of preparing defensive fortifications between the Tennessee River and Owl Creek, and clearing fields of fire, they spent most of their time drilling the largely inexperienced troops while Sherman dismissed reports of nearby Confederates.