Statistics for occurrence #1 of “a Lieutenant-Colonel Comstock” in chapter 3 of Colonel Theodore Lyman, With Grant and Meade from the Wilderness to Appomattox:

... Yesterday we all rode to Culpeper, and saw General Grant, who went last night to Washington, and did go thence to Annapolis. I was well pleased with all the officers down there; among others was a Lieutenant-Colonel Comstock , a Massachusetts man. He had somewhat the air of a Yankee schoolmaster, buttoned in a military coat. Grant is a man of a good deal of rough dignity; rather taciturn; quick and decided in speech. ...
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