In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.

Question: Who was the commander of the Army of Tennessee during the Battle of Chickasaw Bayou? Passage:At the outbreak of the Civil War, Smith became a colonel of the 2nd California Volunteer Cavalry in the Union Army, rising early in 1862 to the rank of brigadier general in the United States Volunteers and to the chief command of the cavalry in the Department of the Missouri. From March through July, he served in the same capacity in the Department of the Mississippi. Assigned afterwards to the Army of the Tennessee, he took part in the Battle of Chickasaw Bayou and the capture of Arkansas Post. He commanded a division of the XIII Corps in the Vicksburg Campaign. Later, he led a division of the XVI Corps in the Red River Campaign of Maj. Gen. Nathaniel Banks. He received the brevet rank of colonel in the regular army for his services at the action of Pleasant Hill.
b