George McClellan
union
No. He was a Union General, popular with the rank and file, but mistrusted in Washington, where some of Lincoln's cabinet doubted his loyalty. After Lincoln eventually sacked him, he stood against him in the 1864 election, but lost.
Lincoln fired McClellan twice.
The Union general that President Lincoln placed in charge of the department of Mississippi was Ulysses S. Grant.
George McClellan gave him the most problems. But Halleck was also a big disappointment in the top job, and had to be replaced eventually.
General Grant
general Eye C. vieners
General George B. McClellan
general grant
By all accounts, US President Lincoln believed that general Ulysses S. Grant was the Union's most valuable general. Lincoln appointed him as commander of all Union military forces and had Grant report directly to the president.
Major General George Brinton McClellan.
George McLellan